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A032304 "EFK" (unordered, size, unlabeled) transform of 1,3,5,7,... 1
1, 1, 3, 8, 12, 31, 56, 107, 168, 372, 620, 1032, 1819, 2888, 5228, 8821, 13692, 21764, 36528, 54756, 92384, 145180, 222809, 339596, 524468, 803716, 1204461, 1884224, 2844820, 4202784, 6291608, 9287236, 13623388, 20316140, 29251828, 43892909, 64068484, 92248760 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1000

C. G. Bower, Transforms (2)

FORMULA

G.f.: Product{k >= 1} (1 + (2*k-1)*x^k).

PROG

(PARI) seq(n)={Vec(prod(k=1, n, 1 + (2*k-1)*x^k + O(x*x^n)))} \\ Andrew Howroyd, Sep 20 2018

CROSSREFS

Sequence in context: A058582 A178720 A027292 * A032217 A032142 A032046

Adjacent sequences:  A032301 A032302 A032303 * A032305 A032306 A032307

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

a(0)=1 prepended and terms a(33) and beyond from Andrew Howroyd, Sep 20 2018

STATUS

approved

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Last modified October 20 11:39 EDT 2018. Contains 316379 sequences. (Running on oeis4.)