A026067 a(n) = (d(n)-r(n))/2, where d = A026066 and r is the periodic sequence with fundamental period (1,0,0,0).

52, 84, 123, 170, 225, 290, 364, 448, 542, 648, 765, 894, 1035, 1190, 1358, 1540, 1736, 1948, 2175, 2418, 2677, 2954, 3248, 3560, 3890, 4240, 4609, 4998, 5407, 5838, 6290, 6764, 7260, 7780, 8323, 8890, 9481, 10098, 10740, 11408, 12102, 12824, 13573, 14350, 15155, 15990, 16854

Offset

7,1

Links

Table of n, a(n) for n=7..53.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1,1,-3,3,-1).

Formula

G.f.: x^7*( 52-72*x+27*x^2+x^3+74*x^5-28*x^6-52*x^4 ) / ( (1+x)*(x^2+1)*(x-1)^4 ). - R. J. Mathar, Jun 23 2013

Crossrefs

Cf. A026066.

Sequence in context: A090793 A090791 A234099 * A039475 A377991 A274338

Adjacent sequences: A026064 A026065 A026066 * A026068 A026069 A026070

Keyword

nonn,easy

Author

Clark Kimberling

Status

approved