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A259524
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T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111
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9
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12, 38, 38, 120, 208, 120, 380, 1122, 1122, 380, 1204, 6100, 10148, 6100, 1204, 3816, 33162, 93028, 93028, 33162, 3816, 12096, 180370, 851604, 1447270, 851604, 180370, 12096, 38344, 981092, 7802386, 22453286, 22453286, 7802386, 981092, 38344
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OFFSET
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1,1
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COMMENTS
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Table starts
.....12.......38........120...........380............1204..............3816
.....38......208.......1122..........6100...........33162............180370
....120.....1122......10148.........93028..........851604...........7802386
....380.....6100......93028.......1447270........22453286.........348802846
...1204....33162.....851604......22453286.......589476522.......15503669216
...3816...180370....7802386.....348802846.....15503669216......690701197282
..12096...981092...71482990....5417785744....407656116320....30760063948568
..38344..5336678..654942820...84159480298..10720344908210..1370113260798484
.121552.29029222.6000746068.1307320968014.281914700860322.61026150956984294
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = 4*a(n-1) -2*a(n-2) -2*a(n-3)
k=2: a(n) = 7*a(n-1) -7*a(n-2) -10*a(n-3) +10*a(n-4) +2*a(n-5)
k=3: [order 10]
k=4: [order 19]
k=5: [order 36]
k=6: [order 71]
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EXAMPLE
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Some solutions for n=3 k=4
..0..0..1..0..1....0..0..0..0..0....0..1..0..0..0....0..1..0..1..1
..1..1..0..0..1....1..0..0..0..0....0..0..0..0..0....1..0..1..0..0
..0..0..0..0..1....0..0..0..0..1....1..0..1..1..0....0..0..0..0..0
..1..0..0..0..1....0..1..0..1..0....1..0..1..1..0....1..0..0..1..0
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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