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 A109877 #4 Dec 05 2013 19:57:00 %S A109877 1,5,23,108,574,3553,25451,207744,1904010,19357873,216180227, %T A109877 2630384900,34634700918,490653944569,7441157228467,120286142846816, %U A109877 2064606497134554,37499986847250777,718589662860007003,14487877657131343316 %N A109877 Row sums of A109876. %Y A109877 Cf. A109876. %K A109877 nonn %O A109877 1,2 %A A109877 _Amarnath Murthy_, Jul 10 2005 %E A109877 Fixed offset, added terms. - _David Wasserman_, Oct 15 2008