OFFSET
1,1
COMMENTS
Column 7 of A253223
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 1306624*n^2 - 20460244*n + 81385043 for n>12
EXAMPLE
Some solutions for n=4
..0..1..2..2..3..3..4....0..0..1..2..3..3..4....0..0..1..2..3..3..4
..1..1..2..2..3..4..4....0..1..1..2..3..3..4....0..1..1..2..3..3..4
..2..2..2..3..3..4..4....1..1..1..2..3..3..4....1..1..2..2..3..4..4
..2..2..2..3..3..4..4....1..1..1..2..3..3..4....2..2..2..2..3..4..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2014
STATUS
approved