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 A275636 a(n) = (3^n-1)*(3^n+3)/3!. 1
 0, 2, 16, 130, 1120, 9922, 88816, 797890, 7176640, 64576642, 581150416, 5230235650, 47071766560, 423644836162, 3812800336816, 34315193465410, 308836712490880, 2779530326324482, 25015772678640016, 225141953332919170, 2026277577671749600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES Turner, Zachary J., Bryson W. Finklea, and Terri Moore. "Combinatorial Approaches to Minimal Zero Sequences of Finite Abelian Groups, and a Surprising Connection." Preprint, Jan 09 2004. LINKS Colin Barker, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (13,-39,27). FORMULA From Chai Wah Wu, Aug 09 2016: (Start) a(n) = 13*a(n-1) - 39*a(n-2) + 27*a(n-3) for n > 2. G.f.: 2*x*(5*x - 1)/((x - 1)*(3*x - 1)*(9*x - 1)). (End) a(n) = (2*3^n+9^n-3)/6. - Colin Barker, Aug 10 2016 CROSSREFS Sequence in context: A067684 A074623 A323946 * A002576 A037727 A037622 Adjacent sequences:  A275633 A275634 A275635 * A275637 A275638 A275639 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Aug 09 2016 STATUS approved

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Last modified June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)