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 A128323 #3 Mar 30 2012 18:37:03 %S A128323 1,5,12,73,418,3110,23920,207549,1885166,18417710,187881112, %T A128323 2018628090,22533601892,261966343388,3149344100224,39158513865053, %U A128323 501507474201750,6611648592425790,89492095211184360,1242626064512513070 %N A128323 Column 2 of triangle A128320. %o A128323 (PARI) %Y A128323 Cf. A128320 (triangle), A128321 (column 0), A128322 (column 1), A128324 (row sums); variant: A115083. %K A128323 nonn %O A128323 0,2 %A A128323 _Paul D. Hanna_, Feb 25 2007