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 A176728 #10 Aug 29 2019 17:21:22 %S A176728 1,0,-1,0,-17,0,-1955,0,-44089,0,-4627969,0,-10431967727,0, %T A176728 -424734574531,0,-187497600357613,0,-263146180762981877,0, %U A176728 -77335840394370605087,0,-38414950218116664660463,0,-95193934978797641162562791,0,-1044549307308161782597280065,0,-836232289988098415162220532417 %N A176728 Numerator of z-sequence for Sheffer triangle A060081. %C A176728 The denominator sequence is A176729. %C A176728 For a- and z-sequences for Sheffer triangles see the W. Lang link under A006232. %H A176728 W. Lang: <a href="/A176728/a176728.txt">Rationals A176728/A176729. </a> %F A176728 E.g.f. for rationals A176728/A176729: (1-sqrt(1-x^2))/log(sqrt((1+x)/(1-x))). For n=0 one has a(0)=0. %e A176728 Rationals A176728/A176729 with offset 0: [0,1/2,0,-1/4,0,-17/6,0,-1955/24,0,-44089/10,0,-4627969/12,... ]. %Y A176728 A176726/A176727 a-sequence for triangle A060081. %K A176728 sign,easy,frac %O A176728 1,5 %A A176728 _Wolfdieter Lang_, Jul 14 2010