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 A057507 #6 May 01 2014 02:48:29 %S A057507 1,1,1,2,3,10,18,46,95,236,528,1288,2936,6984,16212,38528,90717, %T A057507 216648,516358,1240818,2979992 %N A057507 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506. %C A057507 For the convenience of the range notation above, we define A014137(-1) and A014138(-1) as zero. %H A057507 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %Y A057507 a(n) = A081148(n)+A081150(n). Bisections: A081151, A081167. Cf. A057545, A060114, A081164. %Y A057507 Occurs for first time in A073201 as row 2614. %K A057507 nonn,more %O A057507 0,4 %A A057507 _Antti Karttunen_, Sep 03 2000