OFFSET
0,2
FORMULA
a(n) = A245667(2n,n).
EXAMPLE
a(1) = 3: 11, 21, 22.
a(2) = 175: 1112, 1113, 1114, 1121, ..., 4414, 4423, 4424, 4434.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 16 2016
STATUS
approved