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 A162963 a(n) = 5*a(n-2) for n > 2; a(1) = 2, a(2) = 5. 4
 2, 5, 10, 25, 50, 125, 250, 625, 1250, 3125, 6250, 15625, 31250, 78125, 156250, 390625, 781250, 1953125, 3906250, 9765625, 19531250, 48828125, 97656250, 244140625, 488281250, 1220703125, 2441406250, 6103515625, 12207031250 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Binomial transform is A162770, second binomial transform is A001077 without initial 1, third binomial transform is A162771, fourth binomial transform is A162772, fifth binomial transform is A162773. LINKS Index entries for linear recurrences with constant coefficients, signature (0,5). FORMULA a(n) = (3-(-1)^n)*5^(1/4*(2*n-1+(-1)^n))/2. G.f.: x*(2+5*x)/(1-5*x^2). a(n) = A026383(n) for n >= 1. PROG (MAGMA) [ n le 2 select 3*n-1 else 5*Self(n-2): n in [1..29] ]; CROSSREFS Cf. A000351 (powers of 5), A026383, A001077, A162770, A162771, A162772, A162773. Sequence in context: A336542 A018356 A026383 * A297860 A002094 A212709 Adjacent sequences:  A162960 A162961 A162962 * A162964 A162965 A162966 KEYWORD nonn,easy AUTHOR Klaus Brockhaus, Jul 19 2009 STATUS approved

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Last modified August 9 12:53 EDT 2020. Contains 336323 sequences. (Running on oeis4.)