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 A056592 #4 Mar 31 2012 13:20:04 %S A056592 1,0,-2,-6,-14,0,278,2520,15016,0,-2172632,-53222400,-835765304,0, %T A056592 851104689248,55249242048000,2288258540319136,0,-16212819419809777952, %U A056592 -2773508758631170560000,-302332135138133434911104,0,14824259801049378686209605248 %N A056592 Row sums of signed triangle A056588. %F A056592 a(n)= sum(A056588(n, m), m=0..n), n >= 0. %Y A056592 Cf. A000045, A056588, A056593. %K A056592 sign,easy %O A056592 0,3 %A A056592 _Wolfdieter Lang_ Jul 10 2000