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 A026058 a(n) = (d(n)-r(n))/2, where d = A026057 and r is the periodic sequence with fundamental period (0,0,1,0). 0
 13, 25, 41, 63, 90, 123, 162, 209, 263, 325, 395, 475, 564, 663, 772, 893, 1025, 1169, 1325, 1495, 1678, 1875, 2086, 2313, 2555, 2813, 3087, 3379, 3688, 4015, 4360, 4725, 5109, 5513, 5937, 6383, 6850, 7339, 7850, 8385, 8943, 9525, 10131, 10763, 11420, 12103, 12812, 13549, 14313, 15105, 15925 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 LINKS Table of n, a(n) for n=4..54. Index entries for linear recurrences with constant coefficients, signature (3,-3,1,1,-3,3,-1). FORMULA a(n) = - 0.125 - 0.125*( - 1)^n + 0.25*cos(n*Pi/2) + (n + 4)*(n^2 + 20*n + 39)/12. [Richard Choulet, Dec 13 2008] G.f.: x^4*( 13-14*x+5*x^2+2*x^3-14*x^4+15*x^5-5*x^6 ) / ( (1+x)*(x^2+1)*(x-1)^4 ). - R. J. Mathar, Jun 22 2013 CROSSREFS Cf. A026057. Sequence in context: A298483 A344900 A195558 * A032697 A125724 A277714 Adjacent sequences: A026055 A026056 A026057 * A026059 A026060 A026061 KEYWORD nonn,easy AUTHOR Clark Kimberling STATUS approved

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Last modified June 4 03:55 EDT 2023. Contains 363118 sequences. (Running on oeis4.)