OFFSET
15,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 15..1000
EXAMPLE
a(20) = 7: [7,6,4,2,1], [8,5,4,2,1], [10,4,3,2,1], [8,6,3,2,1], [9,5,3,2,1], [6,5,4,3,2], [7,5,4,3,1].
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 27 2014
STATUS
approved