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1, 0, 1, 1, 0, 2, 4, 1, 0, 5, 16, 4, 2, 0, 15, 70, 16, 8, 5, 0, 52, 334, 70, 32, 20, 15, 0, 203, 1720, 334, 140, 80, 60, 52, 0, 877, 9478, 1720, 668, 350, 240, 208, 203, 0, 4140, 55522, 9478, 3440, 1670, 1050, 832, 812, 877, 0, 21147
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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-1,6
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COMMENTS
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Row sums = A005493 prefaced with a 1; (1, 1, 3, 10, 37, 151,...).
Right border = Bell numbers, A000110.
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LINKS
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Table of n, a(n) for n=-1..53.
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FORMULA
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A000012^(-2) * A152431 as infinite lower triangular matrices, where A000012^(-1) = the pairwise difference operator.
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EXAMPLE
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First few rows of the triangle =
1;
0, 1;
1, 0, 2;
4, 1, 0, 5;
16, 4, 2, 0, 15;
70, 16, 8, 5, 0, 52;
334, 70, 32, 20, 15, 0, 203;
1720, 334, 140, 80, 60, 52, 0, 877;
9478, 1720, 668, 350, 240, 208, 203, 0, 4140;
55522, 9478, 3440, 1670, 1050, 832, 812, 877, 0, 21147;
...
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CROSSREFS
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A152431, A005493
Sequence in context: A124091 A067849 A164268 * A094344 A211183 A137391
Adjacent sequences: A152430 A152431 A152432 * A152434 A152435 A152436
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Dec 04 2008
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STATUS
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approved
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