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 A050355 #5 Dec 19 2015 13:30:27 %S A050355 1,1,3,5,9,21,27,81,37,81,111,297,201,243,513,1053,945,729,2187,1317, %T A050355 3645,365,2745,4077,2187,8829,7209,12393,2433,13257,16605,6561,34263, %U A050355 35397,41553,13473,59697,10155,64881,19683,44793,129033,18993,71307 %N A050355 Ordered factorizations with one level of parentheses indexed by prime signatures. A050354(A025487). %K A050355 nonn %O A050355 1,3 %A A050355 _Christian G. Bower_, Oct 15 1999