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 A147634 #7 Apr 14 2020 01:36:26 %S A147634 1,2,6,16,54,232,936,4136,19112,98666,559598,3448160,22951024, %T A147634 164020894,1255124388,10182613618,87879918338 %N A147634 Number of permutations of 1..n with each sum of three adjacent terms unique. %Y A147634 Cf. A091217. %K A147634 nonn,more %O A147634 1,2 %A A147634 _R. H. Hardin_, Nov 09 2008 %E A147634 More terms from _R. H. Hardin_, Nov 11 2008