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 A085643 #3 Mar 31 2012 13:23:37 %S A085643 1,2,1,3,4,1,4,6,4,6,1,5,8,12,9,12,8,1,6,10,16,9,12,36,8,12,24,10,1,7, %T A085643 12,20,24,15,48,36,27,16,72,32,15,40,12,1,8,14,24,30,16,18,60,48,72, %U A085643 54,20,96,144,54,16,20,120,80,18,60,14,1 %N A085643 Refines sequence A078812 using permutations and products of exponents on least prime signatures. %C A085643 The shape sequence for this table is A000041. Row sums in the example are A000079, A006906 and A001906. %e A085643 When the signatures (A025487) are listed in A036035 order the number of permutations of the exponents begin %e A085643 1, 1 1, 1 2 1, 1 2 1 3 1, 1 2 2 3 3 4 1, ... b(n) and the products begin %e A085643 1, 2 1, 3 2 1, 4 3 4 2 1, 5 4 6 3 4 2 1, ... c(n) thus we can write %e A085643 1, 2 1, 3 4 1, 4 6 4 6 1, 5 8 12 9 12 8 1, ... a(n) = b(n)*c(n) %Y A085643 Cf. A078812. %K A085643 nonn,tabf %O A085643 1,2 %A A085643 _Alford Arnold_, Aug 15 2003