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A115238

Row sums of triangle A115237.

1, 3, 9, 19, 38, 65, 108, 165, 247, 350, 489, 658, 876, 1134, 1456, 1830, 2285, 2805, 3425, 4125, 4946, 5863, 6924, 8099, 9443, 10920, 12593, 14420, 16472, 18700, 21184, 23868, 26841, 30039, 33561, 37335, 41470, 45885, 50700, 55825, 61391

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OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (2,1,-4,2,0,-2,4,-1,-2,1).

FORMULA

G.f.: (1+x+2*x^2+2*x^3+x^4)/((1-x)^2*(1-x^2)^2*(1-x^4)). - corrected by G. C. Greubel, Feb 06 2016

MATHEMATICA

f := Series[(1 + x + 2*x^2 + 2*x^3 + x^4)/((1 - x)^2*(1 - x^2)^2*(1 - x^4)), {x, 0, 100}]; CoefficientList[f, x] (* G. C. Greubel, Feb 06 2016 *)

LinearRecurrence[{2, 1, -4, 2, 0, -2, 4, -1, -2, 1}, {1, 3, 9, 19, 38, 65, 108, 165, 247, 350}, 50] (* Harvey P. Dale, Sep 06 2025 *)

CROSSREFS

Sequence in context: A146050 A147500 A300445 * A005994 A080010 A135117

Adjacent sequences: A115235 A115236 A115237 * A115239 A115240 A115241

KEYWORD

nonn,easy

AUTHOR

Christian G. Bower, Jan 17 2006

STATUS

approved

URL: https://oeis.org/A115238

⇱ A115238 - OEIS