OFFSET
1,1
COMMENTS
Column 7 of A189449.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 119*a(n-1) -1238*a(n-2) -11504*a(n-3) +132848*a(n-4) +180912*a(n-5) -203520*a(n-6) +1542400*a(n-7) +2403200*a(n-8) -768000*a(n-9) +640000*a(n-10) for n>14.
EXAMPLE
Some solutions for 3 X 7
..0..1..3..4.12..6..5....0..2..1..3..4.13..6....0..2..1..3..4.13..6
..7..9..8..2.10.20.13....7..8..9.10.11.12..5....7..8..9.10.11.12..5
.15.14.16.17.18.11.19...15.14.16.18.17.20.19...14.15.16.17.18.19.20
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 22 2011
STATUS
approved