The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A303382 Expansion of Product_{n>=1} ((1 + 8*x^n)/(1 - 8*x^n))^(1/8). 4
 1, 2, 4, 50, 98, 1830, 4576, 83950, 236500, 4211766, 12903260, 222377926, 723722602, 12136867530, 41382435824, 678060771778, 2400028798290, 38546050682278, 140724756748476, 2220907298526934, 8323586858891766, 129340015891714962, 495838256186203600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 FORMULA a(n) ~ c * 8^n / n^(7/8), where c = (QPochhammer[-1, 1/8] / QPochhammer[1/8])^(1/8) / Gamma(1/8) = 0.15003359366795844474467456149... - Vaclav Kotesovec, Apr 23 2018 MAPLE seq(coeff(series(mul(((1+8*x^k)/(1-8*x^k))^(1/8), k = 1..n), x, n+1), x, n), n=0..25); # Muniru A Asiru, Apr 23 2018 MATHEMATICA nmax = 25; CoefficientList[Series[Product[((1 + 8*x^k)/(1 - 8*x^k))^(1/8), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Apr 23 2018 *) nmax = 30; CoefficientList[Series[(-7*QPochhammer[-8, x] / (9*QPochhammer[8, x]))^(1/8), {x, 0, nmax}], x] (* Vaclav Kotesovec, Apr 23 2018 *) PROG (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, ((1+8*x^k)/(1-8*x^k))^(1/8))) CROSSREFS Expansion of Product_{n>=1} ((1 + 2^b*x^n)/(1 - 2^b*x^n))^(1/(2^b)): A015128 (b=0), A303346 (b=1), A303360 (b=2), this sequence (b=3). Cf. A303381. Sequence in context: A032019 A181179 A175814 * A303443 A277034 A156498 Adjacent sequences: A303379 A303380 A303381 * A303383 A303384 A303385 KEYWORD nonn AUTHOR Seiichi Manyama, Apr 22 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 10:56 EST 2023. Contains 367589 sequences. (Running on oeis4.)