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 A215250 #9 Aug 11 2014 22:45:49 %S A215250 3,4,4,6,6,6,5,11,5,11,10,6,11,7,2,22,15,13,4,12,14,10,17,9,10,25,8, %T A215250 10,10,14,16,24,13,24,9,14,12,18,16,16,21,32,18,15,6,20,20,16,20,6,23, %U A215250 26,16,16,14,26,21,28,13,24,22,14,16,33,17,32,15,36,18,26,18 %N A215250 a(n) = number of values k >= 0 such that A215244(k) = n. %H A215250 N. J. A. Sloane, <a href="/A215250/b215250.txt">Table of n, a(n) for n = 1..307</a> %H A215250 Cf. A215244, A215245, A215246. %e A215250 A215244 takes the value 4 exactly 6 times, so a(4) = 6. %K A215250 nonn,base %O A215250 1,1 %A A215250 _N. J. A. Sloane_, Aug 11 2012