a(n) is the number of positive Euler permutations of order 2*n. Bisection (even indices) of A347601.

A346719

a(n) is the number of positive Euler permutations of order 2*n. Bisection (even indices) of A347601.

Terms

    a(0) =1a(1) =0a(2) =7a(3) =102a(4) =8109a(5) =642220a(6) =89458803a(7) =15935870034

External references