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A160647
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Self-convolution of sequence A001402
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1
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1, 2, 5, 10, 20, 36, 65, 108, 179, 284, 445, 676, 1017, 1492, 2168, 3094, 4372, 6088, 8406, 11462, 15509, 20770, 27614, 36390, 47646, 61898, 79939, 102538, 130808, 165864, 209272, 262598, 328008, 407700, 504607, 621760, 763123, 932788, 1136047
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| sixth in a list of sequences related to numeric partitions; earlier sequences
are A000027, A006918, A117485, A117486, and A117487.
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EXAMPLE
| a(8) = 108 because the eight anti-diagonal of the associated array is
14 11 14 15 15 14 11 14 and sums to 108.
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MAPLE
| A160647 := proc(n) coeftayl( convert(1/mul((1-x^j)^2, j=1..6), parfrac, x), x=0, n) ; end: seq(A160647(n), n=0..45) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 16 2009]
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CROSSREFS
| A117566
Sequence in context: A160461 A117487 A103924 * A103925 A160525 A103926
Adjacent sequences: A160644 A160645 A160646 * A160648 A160649 A160650
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KEYWORD
| easy,nonn
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AUTHOR
| Alford Arnold (alford1940(AT)aol.com), May 27 2009
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 16 2009
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