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 A091607 #5 Nov 27 2013 20:46:41 %S A091607 1,0,1,1,3,3,5,6,10,12,18,22,32,39,54,67,89,110,144,177,228,280,354, %T A091607 433,542,659,816,989,1214,1464,1784,2142,2593,3101,3730,4444,5318, %U A091607 6310,7514,8886,10534,12413,14656,17214,20249,23711,27790,32447,37908,44134 %N A091607 Column 4 of triangle A091602. %H A091607 Alois P. Heinz, <a href="/A091607/b091607.txt">Table of n, a(n) for n = 4..1000</a> %F A091607 a(n) = A035959(n) - A001935(n). %K A091607 nonn %O A091607 4,5 %A A091607 _Christian G. Bower_, Jan 23 2004