OFFSET
1,2
COMMENTS
Column 6 of A264422.
EXAMPLE
Some solutions for n=3
.15..9..7..2.12..4..5....8..9.10.11.12..4..5....8..9..1.18.12..4..5
..0..1.17..3.19.20..6....0.16.24..3.19.20..6....0.16..2..3.19.20..6
.22..8.24.25.11.27.13....7.23.21..1..2.27.13....7.23.21.25.11.27.13
.14.21.16.23.18.10.26...14.15.22.17.18.25.26...14.15.22.17.24.10.26
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 12 2015
STATUS
approved