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 A174014 #5 Mar 30 2012 18:59:26 %S A174014 1,1,1,2,3,1,3,7,5,1,4,13,15,7,1,4,19,33,26,9,1,2,19,53,66,40,11,1,-3, %T A174014 3,51,115,115,57,13,1,-10,-37,-19,103,215,183,77,15,1,-14,-89,-193, %U A174014 -120,173,364,273,100,17,1,-4,-91,-387,-664,-406,252,574,388,126,19,1 %N A174014 Deleham triangle [1,1,-1,1,1,-1,1,...] DELTA [1,0,0,1,0,0,1,0,...], DELTA defined in A084938. %C A174014 First column is A174015. Row sums are A174016. Diagonal sums are A174013. %e A174014 Triangle begins %e A174014 1, %e A174014 1, 1, %e A174014 2, 3, 1, %e A174014 3, 7, 5, 1, %e A174014 4, 13, 15, 7, 1, %e A174014 4, 19, 33, 26, 9, 1, %e A174014 2, 19, 53, 66, 40, 11, 1, %e A174014 -3, 3, 51, 115, 115, 57, 13, 1, %e A174014 -10, -37, -19, 103, 215, 183, 77, 15, 1, %e A174014 -14, -89, -193, -120, 173, 364, 273, 100, 17, 1 %K A174014 easy,sign,tabl %O A174014 0,4 %A A174014 _Paul Barry_, Mar 05 2010