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1, 1, 2, 1, 4, 4, 1, 4, 16, 12, 1, 4, 16, 84, 48, 1, 4, 16, 156, 504, 192, 1, 4, 16, 156, 1464, 3312, 960, 1, 4, 16, 156, 1464, 14112, 24720, 5760, 1, 4, 16, 156, 1464, 24912, 158640, 189360, 34560, 1, 4, 16, 156, 1464, 24912, 400560, 1761840, 1607040, 241920
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table;
graph;
refs;
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history;
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OFFSET
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1,3
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COMMENTS
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Right border = A004527: (1, 2, 4, 12, 48, 192,...). Row sums = A007489 starting (1, 3, 9, 33, 153,...).
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LINKS
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Table of n, a(n) for n=1..55.
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FORMULA
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A000012 * A136717 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
1, 4, 4;
1, 4, 16, 12;
1, 4, 16, 84, 48;
1, 4, 16, 156, 504, 192;
1, 4, 16, 156, 1464, 3312, 960;
...
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CROSSREFS
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Cf. A136717, A004527, A007489.
Sequence in context: A274980 A274826 A129862 * A009949 A070785 A214985
Adjacent sequences: A137590 A137591 A137592 * A137594 A137595 A137596
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Jan 28 2008
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EXTENSIONS
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Typo in eighth row corrected by Olivier Gérard, Oct 30 2012
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STATUS
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approved
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