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 A305779 #5 Jun 10 2018 13:29:48 %S A305779 1,5,19,62,204,627,2006,6045,19091,56804,177431,523072,1618006, %T A305779 4739853,14544372,42440871,129419597,376877914,1143885829,3328765378, %U A305779 10068808024,29308488795,88433869354,257651383313,776063514999,2264100874960,6811218232163,19903182431380 %N A305779 Number of set partitions of [n] with alternating parity of elements and exactly five blocks. %H A305779 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %Y A305779 Column k=5 of A274581. %K A305779 nonn %O A305779 5,2 %A A305779 _Alois P. Heinz_, Jun 10 2018