A071909 A002487(n)*A002487(n+1)*A002487(n+2)/2.

0, 1, 1, 3, 3, 9, 3, 6, 6, 30, 15, 25, 15, 30, 6, 10, 10, 70, 42, 84, 60, 140, 35, 49, 35, 140, 60, 84, 42, 70, 10, 15, 15, 135, 90, 198, 154, 385, 105, 165, 132, 572, 260, 390, 210, 378, 63, 81, 63, 378, 210, 390, 260, 572, 132, 165, 105, 385, 154, 198, 90, 135, 15, 21, 21, 231

Offset

0,4

Links

Table of n, a(n) for n=0..65.

Crossrefs

Sequence in context: A127795 A074724 A109932 * A134662 A145444 A165824

Adjacent sequences: A071906 A071907 A071908 * A071910 A071911 A071912

Keyword

nonn

Author

N. J. A. Sloane, Jun 13 2002

Status

approved