A027323 a(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n for n >= 2; and T is given by A026120.

1, 5, 38, 281, 2116, 16222, 126244, 994860, 7923456, 63679869, 515810606, 4206733157, 34515110876, 284699216035, 2359535370142, 19638957026491, 164089666469232, 1375812276097887, 11572233529290882, 97619679434165691, 825688568949199356, 7001040129052461912

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Crossrefs

Sequence in context: A279265 A129048 A279489 * A110079 A110082 A073508

Adjacent sequences: A027320 A027321 A027322 * A027324 A027325 A027326

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 27 2019

Status

approved