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A026047 a(n) = (d(n)-r(n))/2, where d = A026046 and r is the periodic sequence with fundamental period (0,1,0,1). 0
38, 52, 72, 97, 130, 170, 220, 279, 350, 432, 528, 637, 762, 902, 1060, 1235, 1430, 1644, 1880, 2137, 2418, 2722, 3052, 3407, 3790, 4200, 4640, 5109, 5610, 6142, 6708, 7307, 7942, 8612, 9320, 10065, 10850, 11674, 12540, 13447, 14398, 15392, 16432, 17517, 18650, 19830, 21060, 22339, 23670 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

LINKS

Table of n, a(n) for n=6..54.

Index entries for linear recurrences with constant coefficients, signature (3,-2,-2,3,-1).

FORMULA

a(n)=(n + 6)*(n^2 + 6*n + 38)/6 - 0.5*sin(n*Pi/2)^2 [From Richard Choulet, Dec 13 2008]

G.f. x^6*( 38-62*x-8*x^2+61*x^3-27*x^4 ) / ( (1+x)*(x-1)^4 ). - R. J. Mathar, Jun 22 2013

CROSSREFS

Sequence in context: A078539 A282813 A125970 * A039352 A043175 A043955

Adjacent sequences:  A026044 A026045 A026046 * A026048 A026049 A026050

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)