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 A271790 #5 Apr 14 2016 12:21:11 %S A271790 0,1,10,61,313,1520,7373,36627,188396,1007708,5612677,32551400, %T A271790 196447095,1232448403,8028591686,54240974862,379574487845, %U A271790 2748022434268,20558256639096,158746877185099,1263892981174760,10364745848886935,87464284123646375,758804198576946316 %N A271790 Number of set partitions of [n] having exactly three pairs (m,m+1) such that m is in some block b and m+1 is in block b+1. %H A271790 Alois P. Heinz, <a href="/A271790/b271790.txt">Table of n, a(n) for n = 3..300</a> %e A271790 a(4) = 1: 1|2|3|4. %e A271790 a(5) = 10: 12|3|4|5, 13|24|5, 1|23|4|5, 14|25|3, 1|24|35, 1|2|34|5, 15|2|3|4, 1|25|3|4, 1|2|35|4, 1|2|3|45. %Y A271790 Column k=3 of A185982. %K A271790 nonn %O A271790 3,3 %A A271790 _Alois P. Heinz_, Apr 14 2016