OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..833
FORMULA
a(n) = 2^n/n! * Product_{k=0..n-1} (8*k - 1) for n > 0.
a(n) = -sqrt(2-sqrt(2)) * Gamma(1/8) * Gamma(n-1/8) * 16^(n-1) / (Pi*Gamma(n+1)). - Vaclav Kotesovec, Jun 16 2018
a(n) ~ -2^(4*n-3) / (Gamma(7/8) * n^(9/8)). - Vaclav Kotesovec, Jun 16 2018
D-finite with recurrence: n*a(n) +2*(-8*n+9)*a(n-1)=0. - R. J. Mathar, Jan 20 2020
a(n) = -2*A097184(n-1). - R. J. Mathar, Jan 20 2020
PROG
(PARI) N=20; x='x+O('x^N); Vec((1-16*x)^(1/8))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jun 15 2018
STATUS
approved