OFFSET
1,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000 (first 210 terms from R. H. Hardin)
EXAMPLE
All solutions for n=4:
..6....4
..4....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2015
STATUS
approved