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A110857
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Table T(n,k), n>=0, k>=0, product M*M^(T) where M is the lower triangular matrix in A106566 and M^(T) denotes the transpose matrix of M, read by antidiagonals.
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0
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1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 2, 2, 2, 0, 0, 5, 4, 4, 5, 0, 0, 14, 10, 9, 10, 14, 0, 0, 42, 28, 23, 23, 28, 42, 0, 0, 132, 84, 65, 60, 65, 84, 132, 0, 0, 429, 264, 196, 171, 171, 196, 264, 429, 0, 0, 1430, 858, 618, 518, 490, 518, 618, 858, 1430, 0
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OFFSET
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0,12
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LINKS
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EXAMPLE
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Matrix M:
1, 0, 0, 0, 0, 0, 0, 0, ...
0, 1, 0, 0, 0, 0, 0, 0, ...
0, 1, 1, 0, 0, 0, 0, 0, ...
0, 2, 2, 1, 0, 0, 0, 0, ...
0, 5, 5, 3, 1, 0, 0, 0, ...
...
Matrix M^(T):
1, 0, 0, 0, 0, 0, ...
0, 1, 1, 2, 5, 14, ...
0, 0, 1, 2, 5, 14, ...
0, 0, 0, 1, 3, 9, ...
0, 0, 0, 0, 1, 4, ...
0, 0, 0, 0, 0, 1, ...
...
Table begins:
1, 0, 0, 0, 0, 0, 0, ...
0, 1, 1, 2, 5, 14, ...
0, 1, 2, 4, 10, 28, ...
0, 2, 4, 9, 23, 65, ...
0, 5, 10, 23, 60, ...
0, 14, 28, 65, 171, ...
0, 42, 84, 196, ...
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CROSSREFS
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Diagonal sums : 1, 0, 1, 2, 6, 18, 57, 186, 622, 2120, ... see A000957.
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KEYWORD
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AUTHOR
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STATUS
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approved
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