OFFSET
1,2
COMMENTS
Column 4 of A239030
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 50*a(n-2) -1020*a(n-4) +11131*a(n-6) -71319*a(n-8) +275531*a(n-10) -629492*a(n-12) +789744*a(n-14) -456320*a(n-16) +76800*a(n-18)
EXAMPLE
Some solutions for n=5
..2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0
..1..0..0..2....2..0..0..0....1..0..2..2....1..0..2..2....2..0..0..0
..2..0..0..1....1..0..0..0....2..0..1..2....2..0..1..2....1..2..2..0
..1..0..0..0....1..2..2..0....2..0..0..1....1..2..2..0....2..1..1..2
..2..0..0..0....2..1..1..0....1..2..2..1....2..1..2..0....1..0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 09 2014
STATUS
approved