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A137160 G.f.: 1 = Sum_{n>=0} a(n)*x^n*(1-x)/(1+x)^(2^n). 4
1, 2, 4, 12, 64, 664, 13856, 584668, 49751520, 8509625760, 2919099754336, 2005648412219832, 2758163973596156000, 7588978611071894509464, 41769719229784446295570112, 459846172005153447271276789620 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Equals the unsigned row sums of triangle A137156.

LINKS

Table of n, a(n) for n=0..15.

PROG

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

CROSSREFS

Cf. A137156; A001192, A137157, A137158, A137159.

Sequence in context: A004400 A005831 A136512 * A217716 A129824 A266463

Adjacent sequences:  A137157 A137158 A137159 * A137161 A137162 A137163

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 24 2008

STATUS

approved

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Last modified January 26 06:32 EST 2021. Contains 340434 sequences. (Running on oeis4.)