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1, 0, 1, 2, 0, 2, 0, 6, 0, 6, 24, 0, 24, 0, 24, 0, 120, 0, 120, 0, 120, 720, 0, 720, 0, 720, 0, 720, 0, 5040, 0, 5040, 0, 5040, 0, 5040
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,4
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COMMENTS
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Row sums = A052558: (1, 1, 4, 12, 72, 360, ...).
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LINKS
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Table of n, a(n) for n=0..35.
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FORMULA
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A136572 * A128174 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle:
1;
0, 1;
2, 0, 2;
0, 6, 0, 6;
24, 0, 24, 0, 24;
0, 120, 0, 120, 0, 120;
...
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CROSSREFS
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Cf. A000142, A052558, A128174, A136572.
Sequence in context: A002117 A042970 A158327 * A354607 A175950 A339423
Adjacent sequences: A136578 A136579 A136580 * A136582 A136583 A136584
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Jan 09 2008
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STATUS
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approved
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