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A157317 G.f. A(x) = Product_{n>=1} 1/(1 - 2^(n^2)*x^n). 0
1, 2, 20, 552, 66896, 33696416, 68788184384, 563088100346496, 18447871370917745920, 2417888544016592098109952, 1267655436300759217689238066176, 2658458526919399457630738994278213632 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

EXAMPLE

G.f.: A(x) = 1 + 2*x + 20*x^2 + 552*x^3 + 66896*x^4 + 33696416*x^5 +...

PROG

(PARI) a(n)=polcoeff(1/prod(k=1, n, 1-2^(k^2)*x^k+x*O(x^n)), n)

CROSSREFS

Cf. A000041.

Sequence in context: A009344 A009699 A101927 * A009399 A197743 A009182

Adjacent sequences:  A157314 A157315 A157316 * A157318 A157319 A157320

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Mar 17 2009

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Last modified February 17 08:21 EST 2012. Contains 205998 sequences.