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 A050316 #9 Apr 15 2018 08:51:25 %S A050316 1,1,3,4,8,11,23,35,54,79,123,177,260,368,557,831,1160,1677,2346,3310, %T A050316 4545,6326,8611,11799,15805,21344,28352,37835,49701,65730,86123, %U A050316 113520,147322,193012,249649,324677,418017,541731,695399,894747,1143262,1464785,1864629 %N A050316 a(n) = A050314(2n+1,1): column 1 of triangle. %Y A050316 Cf. A050314. %K A050316 nonn %O A050316 0,3 %A A050316 _Christian G. Bower_, Sep 15 1999