A027110 a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1), with T given by A027082.

2, 11, 80, 591, 4492, 34859, 274834, 2194175, 17697088, 143951359, 1179361946, 9721994363, 80573155210, 670916858663, 5609929650932, 47082821529795, 396479220532944, 3348822504340655, 28363386616346538, 240832364304754043, 2049614659600342062

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Crossrefs

Sequence in context: A142722 A320095 A099661 * A341955 A118969 A181068

Adjacent sequences: A027107 A027108 A027109 * A027111 A027112 A027113

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 23 2019

Status

approved