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 A026038 a(n) = (d(n)-r(n))/2, where d = A026037 and r is the periodic sequence with fundamental period (1,0,0,1). 0
 5, 11, 20, 33, 52, 78, 111, 152, 203, 265, 338, 423, 522, 636, 765, 910, 1073, 1255, 1456, 1677, 1920, 2186, 2475, 2788, 3127, 3493, 3886, 4307, 4758, 5240, 5753, 6298, 6877, 7491, 8140, 8825, 9548, 10310, 11111, 11952, 12835, 13761, 14730, 15743, 16802, 17908, 19061, 20262, 21513, 22815, 24168 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 LINKS Index entries for linear recurrences with constant coefficients, signature (4,-7,8,-7,4,-1). FORMULA G.f. x^3*( 5-9*x+11*x^2-10*x^3+7*x^4-2*x^5 ) / ( (x^2+1)*(x-1)^4 ). - R. J. Mathar, Jun 22 2013 CROSSREFS Sequence in context: A034308 A032527 A212978 * A080957 A118375 A225376 Adjacent sequences:  A026035 A026036 A026037 * A026039 A026040 A026041 KEYWORD nonn AUTHOR STATUS approved

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Last modified April 3 04:21 EDT 2020. Contains 333195 sequences. (Running on oeis4.)