OFFSET
4,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 4..180
EXAMPLE
a(4) = 4: [1,1,1,1], [2,2,2,2], [3,3,3,3], [4,4,4,4].
a(8) = 2*C(8,2) = 56: [1,1,1,1,2,2,2,2], ..., [8,8,8,8,7,7,7,7].
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 28 2013
STATUS
approved