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A363380 G.f. satisfies A(x) = 1 + x * A(x)^4 * (1 + A(x)^2). 1
1, 2, 20, 284, 4712, 85392, 1638112, 32699472, 672188768, 14133399744, 302535052160, 6570819330688, 144442463464704, 3207564324825600, 71848240540852224, 1621452789508328704, 36831997860270007808, 841470878382566444032 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(4*n+2*k+1,n)/(4*n+2*k+1).
PROG
(PARI) a(n) = sum(k=0, n, binomial(n, k)*binomial(4*n+2*k+1, n)/(4*n+2*k+1));
CROSSREFS
Sequence in context: A217364 A365771 A326010 * A349963 A246482 A124211
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, May 29 2023
STATUS
approved

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Last modified February 23 11:05 EST 2024. Contains 370283 sequences. (Running on oeis4.)