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 A026064 a(n) = (d(n)-r(n))/2, where d = A026063 and r is the periodic sequence with fundamental period (1,1,0,1). 1
 35, 59, 90, 127, 172, 225, 287, 357, 437, 527, 628, 739, 862, 997, 1145, 1305, 1479, 1667, 1870, 2087, 2320, 2569, 2835, 3117, 3417, 3735, 4072, 4427, 4802, 5197, 5613, 6049, 6507, 6987, 7490, 8015, 8564, 9137, 9735, 10357, 11005, 11679, 12380, 13107, 13862, 14645, 15457, 16297 (list; graph; refs; listen; history; text; internal format)
 OFFSET 6,1 LINKS Index entries for linear recurrences with constant coefficients, signature (3,-3,1,1,-3,3,-1). FORMULA a(n)=(n + 6)*(n^2 + 30*n + 71)/12 - 0.375 + 0.125*( - 1)^n - 0.25*cos(n*Pi/2) [From Richard Choulet, Dec 13 2008] G.f. x^6*( 35-46*x+18*x^2-x^3-33*x^4-17*x^6+46*x^5 ) / ( (1+x)*(x^2+1)*(x-1)^4 ). - R. J. Mathar, Jun 23 2013 CROSSREFS Sequence in context: A095958 A244057 A219457 * A250764 A245274 A092256 Adjacent sequences:  A026061 A026062 A026063 * A026065 A026066 A026067 KEYWORD nonn AUTHOR STATUS approved

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Last modified January 21 13:52 EST 2020. Contains 331113 sequences. (Running on oeis4.)