OFFSET
1,1
COMMENTS
Column 7 of A263519.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..68
EXAMPLE
Some solutions for n=2
..0..1..2..3..4..5..6..7....0..1..3..4.12.13.14.15....0..1..2..3..4..5..7.15
..8..9.10.11.12.13.15.14....8..9..2.10.11..5..6..7....9..8.11.10.20.13..6.23
.16.17.19.18.20.21.23.22...16.17.18.19.20.21.23.22...16.17.18.19.12.21.14.22
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 19 2015
STATUS
approved