OFFSET
1,2
COMMENTS
Column 6 of A264490.
EXAMPLE
Some solutions for n=4
..7..8..9.10.11..6.13....7..8..9.10.20.12.13....7..8..3.10.11..6.13
..0..1..2..3..4.19.20....0.15.25..3..4.19..6...14.15.16.17.18..5.20
.21.22.23.24.34.26..5...30.22..1..2.11.26..5...21..0..1..2.34..4.27
.28.15.30.17.32.33.12...28.29.16.31.32.33.34...28..9.30.31.32.33.12
.29.14.31.16.25.18.27...21.14.23.24.17.18.27...29.22.23.24.25.26.19
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 14 2015
STATUS
approved