A160647 Self-convolution of sequence A001402.

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

Offset

1,2

Links

Table of n, a(n) for n=1..39.

Example

a(8) = 108 because the eighth antidiagonal of the associated array is 14 11 14 15 15 14 11 14 and sums to 108.

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) ; # R. J. Mathar, Jun 16 2009

Crossrefs

Cf. A117566.

Sixth in a list of sequences related to numeric partitions; earlier sequences are A000027, A006918, A117485, A117486, and A117487.

Sequence in context: A325650 A325720 A103924 * A103925 A160525 A103926

Adjacent sequences: A160644 A160645 A160646 * A160648 A160649 A160650

Keyword

easy,nonn

Author

Alford Arnold, May 27 2009

Extensions

More terms from R. J. Mathar, Jun 16 2009

Status

approved