OFFSET
1,2
COMMENTS
Diagonal of A263989.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..15
EXAMPLE
Some solutions for n=4
..7..1..9..3..4....0..8..2..3..4....0..1..2..3..4....0..1..9..3..4
..5.13..0..8..2....5..6..7..1..9....5.13..7..8..9...12.13..7..8..2
.17.11.12..6.14...10.11.12.13.14...10.11.19..6.14...10.11..5..6.14
.15.23.10.18.19...22.23.17.18.19...22.16.24.18.12...22.16.17.18.19
.20.21.22.16.24...20.21.15.16.24...20.21.15.23.17...20.21.15.23.24
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 31 2015
STATUS
approved