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 A214494 #5 Feb 22 2013 14:40:37 %S A214494 1,1,1,1,1,1,2,1,3,1,4,3,1,5,7,1,6,12,1,7,18,12,1,8,25,30,1,9,33,55,1, %T A214494 10,49,88,55,1,11,59,137,143,1,12,70,196,280,1,13,82,266,476,280,1,14, %U A214494 95,358,742,756 %N A214494 Triangle read by rows ; T(n,k) = C(n,k) - 2*C(n,k-1) where C(n,k) is a binomial coefficient . %e A214494 Triangle begins : %e A214494 1 %e A214494 1 %e A214494 1 %e A214494 1, 1 %e A214494 1, 2 %e A214494 1, 3 %e A214494 1, 4, 3 %e A214494 1, 5, 7 %e A214494 1, 6, 12 %e A214494 1, 7, 18, 12 %e A214494 1, 8, 25, 30 %e A214494 1, 9, 33, 55 %e A214494 1, 10, 49, 88, 55 %e A214494 1, 11, 59, 137, 143 %e A214494 1, 12, 70, 196, 280 %e A214494 1, 13, 82, 266, 476, 280 %e A214494 1, 14, 95, 348, 742, 756 %e A214494 1, 15, 109, 443, 1090, 1498 %Y A214494 Cf. A007318, A008315 %K A214494 nonn,tabf %O A214494 0,7 %A A214494 _Philippe Deléham_, Jul 19 2012