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 A140431 2*A094555(n). 8
 0, 2, 2, 12, 22, 92, 222, 772, 2102, 6732, 19342, 59732, 175782, 534172, 1588862, 4793892, 14327062, 43090412, 129052782, 387595252, 1161911942, 3487483452, 10458955102, 31383855812, 94137586422, 282440721292, 847266239822 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (2,5,-6). FORMULA b(n) = A091002(n-1); b(n+1)-3b(n)= A077925(n-2), where b(n)=floor(a(n)/10). a(n) = (1-(-2)^n+3^n)/3 for n>0. a(n) = 2*a(n-1)+5*a(n-2)-6*a(n-3) for n>3. G.f.: 2*x*(1-x-x^2)/((1-x)*(1+2*x)*(1-3*x)). [Colin Barker, Sep 21 2012] CROSSREFS Sequence in context: A302368 A202669 A178845 * A092900 A303537 A164961 Adjacent sequences:  A140428 A140429 A140430 * A140432 A140433 A140434 KEYWORD nonn,walk,easy AUTHOR Paul Curtz, Jun 19 2008 EXTENSIONS Edited and extended by R. J. Mathar, Aug 02 2008 STATUS approved

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Last modified July 24 06:56 EDT 2021. Contains 346273 sequences. (Running on oeis4.)