OFFSET
1,3
EXAMPLE
For n = 7 the a(7) = 4 solutions are:
[1,3,3,2,2,1,1],
[1,2,2,3,3,1,1],
[1,1,3,3,2,2,1], and
[1,1,2,2,3,3,1].
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Peter Kagey, Mar 27 2017
STATUS
approved