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A054132 T(2n+1,n), array T as in A054126. 0
3, 13, 68, 394, 2396, 14925, 94248, 600498, 3851012, 24821845, 160646528, 1043245180, 6794418992, 44360061964, 290244849376 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n) = A052509(4*n+2,3*n+2) + A052509(4*n+2,n+1) = 2^n + Sum_{m=0..n+1} binomial(3*n+1,m). - Jianing Song, May 30 2022

PROG

(PARI) a(n) = 2^n + sum(m=0, n+1, binomial(3*n+1, m)) \\ Jianing Song, May 30 2022

CROSSREFS

Sequence in context: A060014 A182666 A042659 * A047149 A200757 A000260

Adjacent sequences:  A054129 A054130 A054131 * A054133 A054134 A054135

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified July 1 10:30 EDT 2022. Contains 354959 sequences. (Running on oeis4.)