|
|
A260924
|
|
Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101
|
|
1
|
|
|
297, 468, 1800, 4522, 11608, 27582, 82766, 191474, 543551, 1291912, 3724868, 8715812, 25061915, 59060378, 169750208, 398939434, 1147482231, 2699112784, 7759824787, 18248954340, 52477167246, 123413127854, 354855957210
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = a(n-1) +31*a(n-4) -31*a(n-5) +97*a(n-6) -97*a(n-7) +39*a(n-8) -39*a(n-9) -144*a(n-10) +144*a(n-11) -29*a(n-12) +29*a(n-13) +189*a(n-14) -189*a(n-15) -125*a(n-16) +125*a(n-17) -14*a(n-18) +14*a(n-19) +40*a(n-20) -40*a(n-21) -13*a(n-22) +13*a(n-23) -a(n-24) +a(n-25) +a(n-26) -a(n-27) for n>28
|
|
EXAMPLE
|
Some solutions for n=4
..0..0..1..0..0..0..1....1..0..0..0..1..0..1....1..0..1..0..1..1..0
..0..0..0..1..0..1..0....0..1..0..1..0..1..0....0..1..0..1..0..0..0
..1..0..1..0..1..0..1....1..0..1..0..1..0..1....1..0..1..0..1..0..1
..0..1..0..1..0..1..0....0..1..0..1..0..1..0....0..0..0..1..0..1..0
..0..0..1..0..1..0..1....1..0..1..0..1..0..0....1..0..1..0..1..0..1
..1..1..0..1..0..1..0....0..1..0..0..0..1..0....0..1..0..1..0..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|