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 A178103 #2 Mar 30 2012 18:59:27 %S A178103 1,0,1,-1,0,1,0,-4,0,1,5,0,-9,0,1,0,33,0,-16,0,1,-45,0,114,0,-25,0,1, %T A178103 0,-408,0,290,0,-36,0,1,585,0,-1890,0,615,0,-49,0,1,0,6705,0,-6240,0, %U A178103 1155,0,-64,0,1,-9945,0,38835,0,-16695,0,1988,0,-81,0,1,0,-137340,0,157395,0 %N A178103 Coefficient array of orthogonal polynomials P(n,x)=x*P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1,P(1,x)=x. %C A178103 First row is aerated signed version of quartic factorial numbers A007696. Inverse is A178104. %e A178103 Triangle begins %e A178103 1, %e A178103 0, 1, %e A178103 -1, 0, 1, %e A178103 0, -4, 0, 1, %e A178103 5, 0, -9, 0, 1, %e A178103 0, 33, 0, -16, 0, 1, %e A178103 -45, 0, 114, 0, -25, 0, 1, %e A178103 0, -408, 0, 290, 0, -36, 0, 1, %e A178103 585, 0, -1890, 0, 615, 0, -49, 0, 1 %e A178103 Production matrix of inverse is %e A178103 0, 1, %e A178103 1, 0, 1, %e A178103 0, 3, 0, 1, %e A178103 0, 0, 5, 0, 1, %e A178103 0, 0, 0, 7, 0, 1, %e A178103 0, 0, 0, 0, 9, 0, 1, %e A178103 0, 0, 0, 0, 0, 11, 0, 1, %e A178103 0, 0, 0, 0, 0, 0, 13, 0, 1, %e A178103 0, 0, 0, 0, 0, 0, 0, 15, 0, 1 %K A178103 sign,tabl %O A178103 0,8 %A A178103 _Paul Barry_, May 20 2010