OFFSET
1,2
COMMENTS
Column 2 of A212026
FORMULA
Empirical: a(n) = (1/128)*n^8 + (1/32)*n^7 - (41/192)*n^6 - (1/4)*n^5 + (345/128)*n^4 - (367/96)*n^3 - (47/96)*n^2 + (97/24)*n - 1 for n>1
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..0.1......1.2......1.2......0.1......1.2......1.2......0.1......1.2
..2.1.3....3.4.5....3.4.5....2.3.4....3.4.5....1.3.4....2.3.4....3.4.5
..4.5.6.7..6.7.2.0..0.6.1.7..5.1.6.7..0.6.7.1..5.6.7.5..5.0.6.7..6.2.7.4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved