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 A301593 #33 Mar 26 2018 19:56:42 %S A301593 1,1,2,0,0,1,2,2,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,2,3,0,0,2,3,3,4,0, %T A301593 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A301593 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A301593 n can be represented the sum of a(n) distinct factorials. (If there is no such representation, a(n) = 0.) %H A301593 Seiichi Manyama, <a href="/A301593/b301593.txt">Table of n, a(n) for n = 1..10000</a> %H A301593 Wikipedia, <a href="http://en.wikipedia.org/wiki/Factoradic">Factorial number system</a> %F A301593 a(n!) = 1, a(n!+1) = 2. %e A301593 n | | a(n) %e A301593 --+------------------------+----- %e A301593 1 | 1! | 1 %e A301593 2 | 2! | 1 %e A301593 3 | 1! + 2! | 2 %e A301593 6 | 3! | 1 %e A301593 7 | 3! + 1! | 2 %e A301593 8 | 3! + 2! | 2 %e A301593 9 | 3! + 2! + 1! | 3 %Y A301593 Cf. A000142, A007489, A038507, A059590, A108731, A115944, A301523. %K A301593 nonn %O A301593 1,3 %A A301593 _Seiichi Manyama_, Mar 24 2018