This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A160445 #24 Dec 05 2022 18:02:07 %S A160445 1,40,718,-41840,-3573428,4674400,15945793480,613094814400, %T A160445 -73925536369520,-7283018465187200,295500169093761760, %U A160445 76056229626701574400,175306544520386380480,-797966872588194008230400,-33928739742998510567799680,8496145352999079190916992000 %N A160445 Numerator of Hermite(n, 20/21). %H A160445 DLMF <a href="https://dlmf.nist.gov/18.9">Digital library of mathematical functions</a>, Table 18.9.1 for H_n(x) %F A160445 E.g.f.: exp(-x*(441*x-40)). - _Vincenzo Librandi_, Jan 20 2017 %F A160445 D-finite with recurrence a(n) = 40*a(n-1)-882*(n-1)*a(n-2). - [DLMF] _Vincenzo Librandi_, Jan 20 2017, corrected Feb 06 2021 %e A160445 Numerators of 1, 40/21, 718/441, -41840/9261, -3573428/194481, ... %t A160445 HermiteH[Range[0,20],20/21]//Numerator (* _Harvey P. Dale_, Dec 05 2022 *) %o A160445 (PARI) a(n)=numerator(polhermite(n, 20/21)) \\ _Charles R Greathouse IV_, Jan 29 2016 %Y A160445 Cf. A009965 (denominators). %K A160445 sign,frac %O A160445 0,2 %A A160445 _N. J. A. Sloane_, Nov 12 2009