A027130 a(n) = Sum_{0<=j<=i<=n} A027113(i, n+j).

1, 4, 13, 40, 119, 350, 1022, 2973, 8635, 25074, 72850, 211875, 616985, 1799092, 5253127, 15358500, 44958889, 131759776, 386557548, 1135204289, 3336791503, 9816315842, 28900431835, 85147344488, 251030187583, 740539502786

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Crossrefs

Partial sums of A027129.

Sequence in context: A119915 A307577 A137744 * A027121 A238846 A025567

Adjacent sequences: A027127 A027128 A027129 * A027131 A027132 A027133

Keyword

nonn

Author

Clark Kimberling

Extensions

Title corrected by Sean A. Irvine, Oct 23 2019

Status

approved