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A327214 Self-convolution of A270913. 4
1, 2, 7, 32, 137, 592, 2597, 11442, 50567, 224112, 995392, 4428372, 19727877, 87983202, 392755207, 1754625632, 7844003907, 35086658052, 157023432677, 703037135122, 3148915010832, 14108913792342, 63235380631747, 283495965998772, 1271282293531077, 5702105357347602 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..1000

FORMULA

a(n) ~ c^2 * Pi * d^n, where d = A270914 = 4.5024767476173544877385939327... and c = A327280 = 0.260542233142438469433860832160... (see A270913).

MATHEMATICA

A270913[n_]:=SeriesCoefficient[Product[(1+x^k)^n, {k, 1, n}], {x, 0, n}];

Table[Sum[A270913[k]*A270913[n-k], {k, 0, n}], {n, 0, 25}]

CROSSREFS

Cf. A022567, A270913, A304443, A309986, A327215.

Sequence in context: A015655 A320682 A344130 * A334855 A334854 A047850

Adjacent sequences: A327211 A327212 A327213 * A327215 A327216 A327217

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Aug 26 2019

STATUS

approved

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Last modified November 28 22:51 EST 2022. Contains 358421 sequences. (Running on oeis4.)