A239838 Number of ordered pairs of permutation functions on n elements where f(f(f(x))) = g(g(g(x))).
1, 1, 2, 12, 96, 600, 9360, 146160, 1935360, 41368320, 1092268800, 23111827200, 700300339200, 26141033318400, 810322216704000, 31624796915712000, 1537594906079232000, 63980698878480384000, 3128302230597992448000, 187447679378885173248000
Offset: 0
Keywords
Links
- Hiroaki Yamanouchi, Table of n, a(n) for n = 0..60
- Hiroaki Yamanouchi, Python code
Crossrefs
Extensions
a(8)-a(12) from Giovanni Resta, Mar 27 2014
a(13) from Alois P. Heinz, Jul 23 2014
a(14)-a(19) from Hiroaki Yamanouchi, Mar 12 2015