A026036 (d(n)-r(n))/5, where d = A006527 and r is the periodic sequence with fundamental period (4,1,4,0,1).

0, 2, 4, 9, 15, 23, 35, 49, 68, 90, 116, 148, 184, 227, 275, 329, 391, 459, 536, 620, 712, 814, 924, 1045, 1175, 1315, 1467, 1629, 1804, 1990, 2188, 2400, 2624, 2863, 3115, 3381, 3663, 3959, 4272, 4600, 4944, 5306, 5684, 6081, 6495, 6927, 7379, 7849, 8340, 8850, 9380, 9932, 10504, 11099, 11715

Offset

2,2

Links

Table of n, a(n) for n=2..56.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1,0,1,-3,3,-1)

Formula

G.f.: [(2-2x+x^2)(1+x^2)x^3]/[(1-x)^3(1-x^5)].

Mathematica

LinearRecurrence[{3, -3, 1, 0, 1, -3, 3, -1}, {0, 2, 4, 9, 15, 23, 35, 49}, 60] (* Harvey P. Dale, Jun 09 2018 *)

Crossrefs

Sequence in context: A347473 A025217 A119759 * A072846 A157254 A080004

Adjacent sequences: A026033 A026034 A026035 * A026037 A026038 A026039

Keyword

nonn,easy

Author

Clark Kimberling

Status

approved