OFFSET
1,1
COMMENTS
Column 4 of A264217.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3
..0..3..1..2..9....5..1..4..2..9....2..6..7..3..4....0..3..1..2..4
.10..5..7..8..4....0..6..7..3..8....0..1..9.13..8...10..5..6.13..9
.12..6.17.18.19...12.10.11.13.14....5.10.11.12.14...12.11..7..8.14
.15.11.16.13.14...15.18.16.17.19...15.16.19.17.18...15.16.19.17.18
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 08 2015
STATUS
approved