OFFSET
1,5
COMMENTS
a(n) <= A065048(n) + 1.
LINKS
JPF et al., A necessary and sufficient condition for (x_1,...,x_n) to be a permutation of (1,...,n). MathOverflow, 2019.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Max Alekseyev, Jul 17 2019
STATUS
approved