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 A357860 #6 Oct 23 2022 23:55:40 %S A357860 1,1,0,1,0,1,0,2,0,1,0,2,0,1,0,2,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,3,0,1, %T A357860 0,2,0,1,0,3,0,1,0,2,0,1,0,5,0,1,0,2,0,1,0,3,0,1,0,3,0,1,0,4,0,1,0,2, %U A357860 0,1,0,4,0,1,0,2,0,1,0,5,0,1,0,3,0,1,0 %N A357860 Number of integer factorizations of n into distinct even factors. %e A357860 The factorizations of 36..48 are (empty columns indicated by dots): %e A357860 36 . 38 . 40 . 42 . 44 . 46 . 48 %e A357860 2*18 2*20 2*22 6*8 %e A357860 4*10 2*24 %e A357860 4*12 %e A357860 2*4*6 %t A357860 facs[n_]:=If[n<=1,{{}},Join@@Table[Map[Prepend[#,d]&,Select[facs[n/d],Min@@#>=d&]],{d,Rest[Divisors[n]]}]]; %t A357860 Table[Length[Select[facs[n],UnsameQ@@#&&OddQ[Times@@(#+1)]&]],{n,100}] %Y A357860 The non-strict version is A349906. %Y A357860 Same as A357859 with zeros every other term. %Y A357860 A000005 counts divisors. %Y A357860 A001055 counts factorizations. %Y A357860 A001221 counts distinct prime factors, sum A001414. %Y A357860 A001222 counts prime-power divisors. %Y A357860 A050361 counts strict factorizations into prime powers. %Y A357860 Cf. A000009, A000688, A000961, A023894, A295935, A318721, A340785. %K A357860 nonn %O A357860 1,8 %A A357860 _Gus Wiseman_, Oct 17 2022