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A369484 revision #4

A369484

Expansion of (1/x) * Series_Reversion( x / ((1+x) * (1+x+x^3)^2) ).

1, 3, 12, 57, 301, 1700, 10045, 61303, 383335, 2443113, 15811317, 103627692, 686402602, 4587643765, 30900426417, 209539509967, 1429344492215, 9801262309209

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

Index entries for reversions of series

PROG

(PARI) a(n, s=3, t=2, u=1) = sum(k=0, n\s, binomial(t*(n+1), k)*binomial((t+u)*(n+1)-k, n-s*k))/(n+1);

CROSSREFS

Sequence in context: A166991 A276366 A243521 * * A151498 A103370

Adjacent sequences: A369481 A369482 A369483 * A369485 A369486 A369487

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Jan 23 2024

STATUS

editing