a(n) is the number of positive Euler permutations of order n.

A347601

a(n) is the number of positive Euler permutations of order n.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =7a(5) =16a(6) =102a(7) =1042a(8) =8109a(9) =63280a(10) =642220a(11) =7500626a(12) =89458803a(13) =1135216800a(14) =15935870034a(15) =241410428162

External references