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 A188168 a(0) = a(1) = 1; a(n) = 5*a(n-1) + 5*a(n-2). 3
 1, 1, 10, 55, 325, 1900, 11125, 65125, 381250, 2231875, 13065625, 76487500, 447765625, 2621265625, 15345156250, 89832109375, 525886328125, 3078592187500, 18022392578125, 105504923828125, 617636582031250, 3615707529296875, 21166720556640625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS First differences give {0,9,45,270,1575,9225,54000,316125,1850625,10833750,63421875,371278125, . . .} LINKS Table of n, a(n) for n=0..22. Index entries for linear recurrences with constant coefficients, signature (5,5). FORMULA G.f.: (4x-1)/(5x^2+5x-1) a(n) = 1/5 2^-n (-(5-3 Sqrt[5])^n (2+Sqrt[5])+(-2+Sqrt[5]) (5+3 Sqrt[5])^n) MATHEMATICA Transpose[NestList[Flatten[{Rest[#], ListCorrelate[{5, 5}, #]}]&, {1, 1}, 40]][[1]] CROSSREFS Cf. A123270. Sequence in context: A253002 A357668 A316109 * A199413 A054629 A290359 Adjacent sequences: A188165 A188166 A188167 * A188169 A188170 A188171 KEYWORD nonn,easy AUTHOR Harvey P. Dale, Mar 23 2011 STATUS approved

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Last modified April 23 02:50 EDT 2024. Contains 371906 sequences. (Running on oeis4.)