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A328128
G.f.: K(4*sqrt(x)) / E(4*sqrt(x)), where E(), K() are complete elliptic integrals.
2
1, 8, 80, 896, 10784, 136448, 1790720, 24160256, 333053504, 4670325248, 66403043840, 954931245056, 13863783325184, 202898094829568, 2989879597076480, 44320135356317696, 660370844304147584, 9884176356444627968, 148535796374189204480, 2240105752104228970496
OFFSET
0,2
COMMENTS
Convolution of A002894 and A188266.
LINKS
FORMULA
a(n) ~ 2^(4*n-1) / n.
MAPLE
seq(coeff(series(EllipticK(4*sqrt(x))/EllipticE(4*sqrt(x)), x, 21), x, n), n = 0..20);
MATHEMATICA
CoefficientList[Series[EllipticK[16*x]/EllipticE[16*x], {x, 0, 20}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Oct 04 2019
STATUS
approved