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A137158 G.f.: 1 = Sum_{n>=0} a(n)*x^n/(1+x)^(4*2^n). 4
1, 4, 22, 228, 4749, 200240, 17034964, 2913479848, 999402129243, 686662003846640, 944294243796543974, 2598186366278914473948, 14300408328085246335179009, 157434326611214704329370130880 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Equals unsigned column 2 of triangle A137156.

LINKS

Table of n, a(n) for n=0..13.

PROG

(PARI) {a(n)=polcoeff(1-sum(k=0, n-1, a(k)*x^k/(1+x+x*O(x^n))^(2^(k+2)) ), n)}

CROSSREFS

Cf. A137156; A001192, A137157, A137159, A137160.

Sequence in context: A197963 A260296 A302769 * A025135 A125801 A195227

Adjacent sequences:  A137155 A137156 A137157 * A137159 A137160 A137161

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 24 2008

STATUS

approved

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Last modified January 18 23:25 EST 2021. Contains 340262 sequences. (Running on oeis4.)