A026982 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026670.

1, 6, 24, 120, 460, 2214, 8475, 40164, 154235, 724742, 2792579, 13050280, 50432693, 234766510, 909442512, 4221139640, 16384219216, 75873259406, 294977735364, 1363503281324, 5308113306398, 24499364386598, 95483014454706, 440147035814920, 1717035728143720, 7906666535747934

Offset

1,2

Links

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

Crossrefs

Sequence in context: A127917 A293118 A293121 * A051197 A374722 A334328

Adjacent sequences: A026979 A026980 A026981 * A026983 A026984 A026985

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved