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 A349907 #10 Dec 15 2021 17:37:53 %S A349907 1,0,1,0,1,0,1,0,2,0,1,0,1,0,2,0,1,0,1,0,2,0,1,0,2,0,3,0,1,0,1,0,2,0, %T A349907 2,0,1,0,2,0,1,0,1,0,4,0,1,0,2,0,2,0,1,0,2,0,2,0,1,0,1,0,4,0,2,0,1,0, %U A349907 2,0,1,0,1,0,4,0,2,0,1,0,5,0,1,0,2,0,2,0,1,0,2,0,2,0,2,0,1,0,4,0,1,0,1,0,5 %N A349907 Number of factorizations of n into odd factors > 1 (a(1) = 1 by convention). %H A349907 Antti Karttunen, <a href="/A349907/b349907.txt">Table of n, a(n) for n = 1..20000</a> %F A349907 a(2n) = 0, a(2n-1) = A001055(2n-1). %o A349907 (PARI) A349907(n, m=n) = if(1==n, 1, my(s=0); fordiv(n, d, if((d>1)&&(d<=m)&&(d%2), s += A349907(n/d, d))); (s)); %Y A349907 Cf. A001055, A349906. %Y A349907 Cf. A000004, A340101 (even and odd bisections). %K A349907 nonn %O A349907 1,9 %A A349907 _Antti Karttunen_, Dec 13 2021