OFFSET
1,1
COMMENTS
Column 4 of A264257.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3
..1..0..7..4..3....5..2..3..4..9....1..0..3..4..2....1..0..3..4..2
..6..5..2.13..8....0..1..8..6..7...10.11..6..9..7....6..5..8..7.14
.15.10.11.12..9...11.16.17.12.19....5.12.17..8.19...15.12.13.18..9
.16.17.18.19.14...10.15.18.13.14...16.15.18.13.14...10.11.16.19.17
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 09 2015
STATUS
approved