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 A016845 a(n) = (4n+3)^9. 2
 19683, 40353607, 2357947691, 38443359375, 322687697779, 1801152661463, 7625597484987, 26439622160671, 78815638671875, 208728361158759, 502592611936843, 1119130473102767, 2334165173090451, 4605366583984375, 8662995818654939, 15633814156853823, 27206534396294947 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..16. Index entries for linear recurrences with constant coefficients, signature (10,-45,120,-210,252,-210,120,-45,10,-1). FORMULA From Amiram Eldar, Apr 24 2023: (Start) a(n) = A004767(n)^9. Sum_{n>=0} 1/a(n) = 511*zeta(9)/1024 - 277*Pi^9/16515072. (End) MATHEMATICA Table[(4*n + 3)^9, {n, 0, 20}] (* Amiram Eldar, Apr 24 2023 *) CROSSREFS Cf. A004767, A013667. Sequence in context: A016761 A250593 A016773 * A016893 A016953 A017025 Adjacent sequences: A016842 A016843 A016844 * A016846 A016847 A016848 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified June 20 09:16 EDT 2024. Contains 373515 sequences. (Running on oeis4.)