A094616 Row sums of A094615.

1, 8, 35, 126, 417, 1324, 4111, 12602, 38333, 116040, 350187, 1054678, 3172249, 9533156, 28632263, 85962354, 258018165, 774316672, 2323474339, 6971471630, 20916512081, 62753730588, 188269580415, 564825518506, 1694510109997

Offset

0,2

Links

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

Formula

a(n) = 2(a(n-1)+3^n)+n-1, a(0)=1.

a(n) = 2*3^(n+1)-2^(n+2)-n-1. - Benoit Cloitre, May 23 2004

Prog

(PARI) a(n)=2*3^(n+1)-2^(n+2)-n-1

Crossrefs

Cf. A094615.

Sequence in context: A248882 A292479 A301881 * A318020 A340522 A114569

Adjacent sequences: A094613 A094614 A094615 * A094617 A094618 A094619

Keyword

nonn

Author

Clark Kimberling, May 14 2004

Status

approved