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 A045630 #15 Feb 09 2016 09:00:40 %S A045630 1,1,2,9,32,125,450,1715,6400,24300,92250,352715,1351584,5200299, %T A045630 20056582,77558625,300533760,1166803109,4537542888,17672631899, %U A045630 68923172000,269128935495,1052049129142,4116715363799,16123800483072 %N A045630 Number of 2n-bead black-white complementable strings with n black beads and fundamental period 2n. %C A045630 For n>0, a(n) is divisible by n (cf. A022553), 2*a(n) is divisible by n^2 (cf. A268619), and 12*a(n) is divisible by n^3 (cf. A268592). - _Max Alekseyev_, Feb 07 2016 %F A045630 Moebius transform of A001700(n-1). - _Christian G. Bower_. %F A045630 For n>0, a(n) = A007727(n)/2 = n * A022553(n). %Y A045630 Cf. A007727. %K A045630 nonn %O A045630 0,3 %A A045630 _David W. Wilson_