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A213578 Antidiagonal sums of the convolution array A213576. 3
1, 4, 13, 34, 80, 174, 359, 712, 1371, 2580, 4768, 8684, 15629, 27852, 49225, 86390, 150704, 261530, 451795, 777360, 1332791, 2277864, 3882048, 6599064, 11191705, 18940564, 31992709, 53943562, 90807056, 152631750, 256190783 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..500

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

FORMULA

a(n) = 4*a(n-1) - 4*a(n-2) - 2*a(n-3) + 4*a(n-4) - a(n-6).

G.f.: (1 + x^2)/(1 - 2*x + x^3)^2.

MATHEMATICA

(See A213576.)

CROSSREFS

Cf. A213576, A213500.

Sequence in context: A101946 A029860 A262200 * A212149 A208740 A127981

Adjacent sequences:  A213575 A213576 A213577 * A213579 A213580 A213581

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 18 2012

STATUS

approved

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Last modified June 25 07:53 EDT 2019. Contains 324347 sequences. (Running on oeis4.)