A027242 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026769.

1, 10, 68, 402, 2258, 12072, 64963, 338824, 1817063, 9467940, 51258781, 269085042, 1475551064, 7822940886, 43422818989, 232480179882, 1303561020575, 7040175844640, 39786449049369, 216469879238194, 1230485470688864, 6736096483008440, 38451562317699992, 211571284685596944

Offset

3,2

Links

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

Crossrefs

Sequence in context: A026984 A104598 A026901 * A081656 A219466 A330352

Adjacent sequences: A027239 A027240 A027241 * A027243 A027244 A027245

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved