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 A064637 #5 May 01 2014 02:49:07 %S A064637 16,17,40,41,60,61,62,63,136,137,160,161,180,181,182,183,288,289,290, %T A064637 291,294,295,296,297,304,305,316,317,450,451,452,453,736,737,760,761, %U A064637 780,781,782,783,856,857,880,881,900,901,902,903,1008,1009,1010,1011 %N A064637 Setwise difference of A060132 and A059590. Those terms of A060132 which are not representable as a sum of distinct factorials. %C A064637 16 is included, as 16 = 220 in factorial base and by following the algorithm PermRevLexUnrankAMSD in A055089 we get the composition (2 3)(3 4) (1 2)(2 3) which, although consisting of different transpositions, is equal to the composition (4 2)(3 1) = 3412 produced by algorithm PermUnrank3R at A060117. %p A064637 list_diff := proc(a,b) local c,e; c := []; for e in a do if(not member(e,b)) then c := [op(c),e]; fi; od; RETURN(c); end; %Y A064637 A064637 := list_diff(A060132, A059590), %Y A064637 Cf. A064477. %K A064637 nonn %O A064637 0,1 %A A064637 _Antti Karttunen_, Oct 02 2001