A211231 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A211231

Row sums of A211230.

1

1, 3, 6, 10, 27, 33, 108, 108, 405, 351, 1458, 1134, 5103, 3645, 17496, 11664, 59049, 37179, 196830, 118098, 649539, 373977, 2125764, 1180980, 6908733, 3720087, 22320522, 11691702, 71744535

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

FORMULA

a(2*n) = (n+1)*3^n; a(2*n+1) = (n+9)*3^(n-1).

O.g.f.: (1+3*x-8*x^3)/(1-3*x^2)^2 = 1 + 3*x + 6*x^2 + 10*x^3 + ....

CROSSREFS

Cf. A211227, A211230.

Sequence in context: A173957 A048006 A364170 * A302094 A068818 A068866

Adjacent sequences: A211228 A211229 A211230 * A211232 A211233 A211234

KEYWORD

nonn,easy

AUTHOR

Peter Bala, Apr 05 2012

STATUS

approved