A027226 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026747.

1, 11, 75, 496, 2523, 14903, 68478, 389040, 1705001, 9552071, 40792260, 227758442, 957346363, 5353798598, 22267534284, 125033595506, 516148089100, 2913354375795, 11958933491775, 67884893610121, 277431526202759, 1583886793301326, 6449958580342975, 37029044240499120

Offset

3,2

Links

Table of n, a(n) for n=3..26.

Crossrefs

Sequence in context: A044579 A231917 A289419 * A300925 A347987 A157232

Adjacent sequences: A027223 A027224 A027225 * A027227 A027228 A027229

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 24 2019

Status

approved