OFFSET
2,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 2..500
EXAMPLE
a(2) = 1: [2].
a(4) = 2: [2,2], [4].
a(6) = 2: [2,2,2], [6].
a(7) = 6: [1,2,4], [1,4,2], [2,1,4], [2,4,1], [4,1,2], [4,2,1].
a(8) = 15: [2,2,2,2], [1,1,2,4], [1,1,4,2], [1,2,1,4], [1,2,4,1], [1,4,1,2], [1,4,2,1], [2,1,1,4], [2,1,4,1], [2,4,1,1], [4,1,1,2], [4,1,2,1], [4,2,1,1], [4,4], [8].
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 23 2014
STATUS
approved