OFFSET
0,4
LINKS
Wikipedia, Permutation
MATHEMATICA
Table[ Count[ Length[ Union[ #/ Range[n]]] & /@ Permutations[ Range@n], n], {n, 0, 9}] (* Giovanni Resta, Mar 09 2020 *)
PROG
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Mar 07 2020
EXTENSIONS
a(13)-a(15) from Giovanni Resta, Mar 09 2020
STATUS
approved