OFFSET
0,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..27
EXAMPLE
a(2) = 1: 2211.
a(3) = 374: 111333222, 113133222, 113313222, ..., 333221121, 333221211, 333222111.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 12 2016
STATUS
approved