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 A165706 #5 Nov 14 2016 22:19:35 %S A165706 1,2,3,3,4,5,5,5,6,6,8,8,8,8,8,8,9,9,9,9,12,12,12,12,12,13,13,13,13, %T A165706 13,13,13,14,14,14,14,14,14,14,14,18,18,18,18,18,18,18,18,18,18,21,21, %U A165706 21,21,21,21,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,22,22,22,22 %N A165706 a(0) = 1, a(n) = a([n/2]) + a([n/5]) for n > 1. %C A165706 For n>0: A165707(n)=a(A003592(n)) and A165707(m)<a(m) for m < A003592(n). %H A165706 R. Zumkeller, <a href="/A165706/b165706.txt">Table of n, a(n) for n = 0..10000</a> %o A165706 (PARI) a(n)=if(n<3, return(n+1)); a(n\2) + a(n\5) \\ _Charles R Greathouse IV_, Nov 14 2016 %Y A165706 Cf. A007731, A083662, A088468, A165704. %K A165706 nonn %O A165706 0,2 %A A165706 _Reinhard Zumkeller_, Sep 26 2009