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A215630
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Triangle read by rows: T(n,k) = n^2 - n*k + k^2, 1 <= k <= n.
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8
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1, 3, 4, 7, 7, 9, 13, 12, 13, 16, 21, 19, 19, 21, 25, 31, 28, 27, 28, 31, 36, 43, 39, 37, 37, 39, 43, 49, 57, 52, 49, 48, 49, 52, 57, 64, 73, 67, 63, 61, 61, 63, 67, 73, 81, 91, 84, 79, 76, 75, 76, 79, 84, 91, 100, 111, 103, 97, 93, 91, 91, 93, 97, 103, 111
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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The triangle begins:
. 1: 1
. 2: 3 4
. 3: 7 7 9
. 4: 13 12 13 16
. 5: 21 19 19 21 25
. 6: 31 28 27 28 31 36
. 7: 43 39 37 37 39 43 49
. 8: 57 52 49 48 49 52 57 64
. 9: 73 67 63 61 61 63 67 73 81
. 10: 91 84 79 76 75 76 79 84 91 100
. 11: 111 103 97 93 91 91 93 97 103 111 121
. 12: 133 124 117 112 109 108 109 112 117 124 133 144 .
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PROG
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(Haskell)
a215630 n k = a215630_tabl !! (n-1) !! (k-1)
a215630_row n = a215630_tabl !! (n-1)
a215630_tabl = zipWith3 (zipWith3 (\u v w -> u - v + w))
a093995_tabl a075362_tabl a133819_tabl
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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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