a(n,k) is the count of permutations with cycle length k in the products w*w over all permutations w of length n.

A191718

a(n,k) is the count of permutations with cycle length k in the products w*w over all permutations w of length n.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =2a(4) =0a(5) =4a(6) =0a(7) =14a(8) =0a(9) =10a(10) =24a(11) =0a(12) =70a(13) =0a(14) =26a(15) =0a(16) =304a(17) =0a(18) =340a(19) =0a(20) =76a(21) =720a(22) =0a(23) =2548a(24) =0a(25) =1540a(26) =0a(27) =232a(28) =0a(29) =13488

External references