A061983 3^n - (3n^2 + n + 2)/2.

0, 0, 1, 11, 54, 202, 671, 2109, 6460, 19556, 58893, 176959, 531218, 1594062, 4782667, 14348561, 43046328, 129139720, 387419993, 1162260915, 3486783790, 10460352530, 31381058871, 94143178021, 282429535604, 847288608492

Offset

0,4

Links

Harry J. Smith, Table of n, a(n) for n=0,...,200

Prog

(PARI) { for (n=0, 200, write("b061983.txt", n, " ", 3^n - (3*n^2 + n + 2)/2) ) } \\ Harry J. Smith, Jul 29 2009

Crossrefs

Column of A061980.

Sequence in context: A213840 A110159 A309921 * A079884 A200172 A348025

Adjacent sequences: A061980 A061981 A061982 * A061984 A061985 A061986

Keyword

nonn

Author

Henry Bottomley, May 24 2001

Status

approved