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 A291701 #12 Aug 30 2017 09:36:46 %S A291701 1,1,0,1,-1,0,1,-2,0,0,1,-3,1,-1,0,1,-4,3,-2,0,0,1,-5,6,-4,2,-1,0,1, %T A291701 -6,10,-8,6,-2,-1,0,1,-7,15,-15,13,-6,1,-1,0,1,-8,21,-26,25,-16,6,0, %U A291701 -2,0,1,-9,28,-42,45,-36,18,-3,0,-2,0,1,-10,36,-64,77,-72 %N A291701 Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of k-th power of continued fraction 1 - x/(1 - x^2/(1 - x^3/(1 - x^4/(1 - x^5/(1 - ...))))). %F A291701 G.f. of column k: (1 - x/(1 - x^2/(1 - x^3/(1 - x^4/(1 - x^5/(1 - ...))))))^k, a continued fraction. %e A291701 Square array begins: %e A291701 1, 1, 1, 1, 1, ... %e A291701 0, -1, -2, -3, -4, ... %e A291701 0, 0, 1, 3, 6, ... %e A291701 0, -1, -2, -4, -8, ... %e A291701 0, 0, 2, 6, 13, ... %Y A291701 Columns k=0..1 give A000007, A291148. %Y A291701 Rows n=0..1 give A000012, A001489. %Y A291701 Main diagonal gives A291702. %Y A291701 Cf. A291652. %K A291701 sign,tabl %O A291701 0,8 %A A291701 _Seiichi Manyama_, Aug 30 2017