A027313 a(n) = Sum_{k=0..2n} (k+1) * A026323(n, 2n-k).

1, 6, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147, 531441, 1594323, 4782969, 14348907, 43046721, 129140163, 387420489, 1162261467, 3486784401, 10460353203, 31381059609, 94143178827, 282429536481, 847288609443

Offset

0,2

Links

Table of n, a(n) for n=0..24.

Formula

For n>1, a(n) = 3^(n+1).

Crossrefs

Sequence in context: A136105 A239568 A198958 * A217365 A307040 A124089

Adjacent sequences: A027310 A027311 A027312 * A027314 A027315 A027316

Keyword

nonn

Author

Clark Kimberling

Status

approved