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 A244762 (5*3^n-2*n-1)/4. 0
 1, 3, 10, 32, 99, 301, 908, 2730, 8197, 24599, 73806, 221428, 664295, 1992897, 5978704, 17936126, 53808393, 161425195, 484275602, 1452826824, 4358480491, 13075441493, 39226324500, 117678973522, 353036920589, 1059110761791, 3177332285398, 9531996856220, 28595990568687, 85787971706089, 257363915118296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n+1) = 3*a(n) + n. G.f. (1-2*x+2*x^2) / ((1-3*x)*(1-x)^2). MATHEMATICA CoefficientList[Series[(1-2*x+2*x^2)/((1-3*x)*(1-x)^2), {x, 0, 30}], x] (* Vaclav Kotesovec, Jul 06 2014 *) CROSSREFS Cf. A108765, A164039, A047926, A000340. Sequence in context: A036682 A104270 A038731 * A053581 A247595 A092822 Adjacent sequences:  A244759 A244760 A244761 * A244763 A244764 A244765 KEYWORD nonn AUTHOR Franklin T. Adams-Watters, Jul 06 2014 STATUS approved

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Last modified January 23 19:12 EST 2020. Contains 331175 sequences. (Running on oeis4.)