A027232 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026758.

1, 4, 19, 72, 355, 1347, 6843, 26077, 135752, 519336, 2760110, 10591394, 57299551, 220393887, 1210772453, 4665698732, 25974365600, 100243916036, 564517479641, 2181476412875, 12407767954139, 48002072364351, 275392803316254, 1066512702720864, 6164746100658825, 23896975393255717

Offset

1,2

Links

Table of n, a(n) for n=1..26.

Crossrefs

Sequence in context: A268214 A027208 A085348 * A256714 A110688 A218920

Adjacent sequences: A027229 A027230 A027231 * A027233 A027234 A027235

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 24 2019

Status

approved