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 A128412 #6 Sep 20 2024 03:20:22 %S A128412 1,-2,1,4,-8,1,-8,36,-12,1,16,-128,80,-16,1,-32,400,-400,140,-20,1,64, %T A128412 -1152,1680,-896,216,-24,1,-128,3136,-6272,4704,-1680,308,-28,1,256, %U A128412 -8192,21504,-21504,10560,-2816 %N A128412 A scaled version of the coefficient array for orthogonal polynomials defined by C(2n,n). %C A128412 Inverse is A128413. %F A128412 Number triangle T(n,k)=A128411(n,k)/(2^(k-1)+0^k/2). %F A128412 Column k has g.f. if(k=0,1/(1+2*x),(1-2*x)*x^k/(1+2*x)^(2*k+1)). %e A128412 Triangle begins: %e A128412 1, %e A128412 -2, 1, %e A128412 4, -8, 1, %e A128412 -8, 36, -12, 1, %e A128412 16, -128, 80, -16, 1, %e A128412 -32, 400, -400, 140, -20, 1, %e A128412 64, -1152, 1680, -896, 216, -24, 1, %e A128412 -128, 3136, -6272, 4704, -1680, 308, -28, 1, %e A128412 256, -8192, 21504, -21504, 10560, -2816, 416, -32, 1, %e A128412 -512, 20736, -69120, 88704, -57024, 20592, -4368, 540, -36, 1, %e A128412 1024, -51200, 211200, -337920, 274560, -128128, 36400, -6400, 680, -40, 1 %K A128412 easy,sign,tabl %O A128412 0,2 %A A128412 _Paul Barry_, Mar 02 2007