OFFSET
0,4
COMMENTS
a(n) >= 1.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..5000
EXAMPLE
For n = 14, the 4 permutations are:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 12, 11, 14]
[1, 2, 3, 4, 7, 6, 5, 8, 9, 14, 11, 12, 13, 10]
[1, 2, 3, 4, 7, 6, 5, 8, 9, 14, 13, 12, 11, 10]
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 01 2022
STATUS
approved