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 A176726 #14 Aug 29 2019 17:20:06 %S A176726 1,0,-2,0,-32,0,-704,0,-54784,0,-2610176,0,-10976325632,0, %T A176726 -52971659264,0,-179326416191488,0,-24309257264168960,0, %U A176726 -69389116291423404032,0,-8404514249426618810368,0,-81520321871322828385550336,0,-438807077783516207378333696,0,-690781531822985516802849636352 %N A176726 Numerator of a-sequence for Sheffer triangle A060081. %C A176726 The denominator sequence is A176727. %C A176726 For a- and z-sequences for Sheffer triangles see the W. Lang link under A006232. %H A176726 W. Lang: <a href="/A176726/a176726.txt">Rationals A176726/A176727. </a> %F A176726 E.g.f. for rational a-sequence A176726/A176727: x/log(sqrt((1+x)/(1- x))). %e A176726 Rationals A176726(n)/A176727(n): [1, 0, -2/3, 0, -32/15, 0, -704/21,0,...]. %t A176726 max = 29; s = x/Log[Sqrt[(1+x)/(1-x)]] + O[x]^max; CoefficientList[s, x] * Range[0, max-1]! // Numerator (* _Jean-François Alcover_, Oct 04 2016 *) %Y A176726 A176728/A176729 z-sequence for triangle A060081. %K A176726 sign,easy,frac %O A176726 0,3 %A A176726 _Wolfdieter Lang_, Jul 14 2010