Number of Sylow permutations in S_n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =23a(5) =99a(6) =479a(7) =2645a(8) =19599a(9) =154007a(10) =1271519a(11) =11688489a(12) =126123095a(13) =1481833859a(14) =15162417087a(15) =126294191309