



0, 0, 4, 20, 72, 232, 716, 2172, 6544, 19664, 59028, 177124, 531416, 1594296, 4782940, 14348876, 43046688, 129140128, 387420452, 1162261428, 3486784360, 10460353160, 31381059564, 94143178780, 282429536432, 847288609392
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OFFSET

0,3


LINKS

Harry J. Smith, Table of n, a(n) for n = 0..200
Index to sequences with linear recurrences with constant coefficients, signature (5,7,3).


FORMULA

Contribution from Bruno Berselli, Jan 31 2012: (Start)
G.f.: 4*x^2/((13*x)*(1x)^2).
a(n) = A186948(n)1.
a(n+2) = 4*A000340(n). (End)


PROG

(PARI) { for (n=0, 200, write("b061981.txt", n, " ", 3^n  2*n  1) ) } [From Harry J. Smith, Jul 29 2009]


CROSSREFS

Column of A061980.
Sequence in context: A123613 A006740 A197426 * A054611 A196432 A196508
Adjacent sequences: A061978 A061979 A061980 * A061982 A061983 A061984


KEYWORD

nonn,easy


AUTHOR

Henry Bottomley, May 24 2001


STATUS

approved



