OFFSET
1,2
COMMENTS
Column 3 of A264490.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=4
..4..5..6..7....4..5..6..7....4..5..3..7....4..5..6..7....4..5..3..7
..8..1..2..3....0..1..2.11....0..9..2.11....0..1.10..3....0..1.10.11
.12..0.14.15....9.13..3.15...12.13..1.15...12.13.14..2...12.13.14..2
.16.17.18.11...16.17.18.19...16..6.18.19...16..9.18.19...16.17.18..6
..9.13.19.10...12..8.14.10...17..8.14.10...17..8.11.15....9..8.19.15
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 14 2015
STATUS
approved