OFFSET
1,1
COMMENTS
Column 3 of A205917.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 16*a(n-1) -8*a(n-2) -775*a(n-3) +2020*a(n-4) +10484*a(n-5) -34209*a(n-6) -68090*a(n-7) +249504*a(n-8) +300963*a(n-9) -1131752*a(n-10) -899412*a(n-11) +3504902*a(n-12) +1424118*a(n-13) -6769192*a(n-14) -1246800*a(n-15) +7700896*a(n-16) +2186200*a(n-17) -6370208*a(n-18) -3919560*a(n-19) +5579640*a(n-20) +2517392*a(n-21) -3579296*a(n-22) -391776*a(n-23) +1328736*a(n-24) -428352*a(n-25) +34560*a(n-26) for n>32.
EXAMPLE
Some solutions for n=4:
..1..2..0..1....1..2..0..2....1..0..0..2....0..0..0..0....2..1..0..2
..2..2..0..0....1..2..2..2....1..0..2..2....2..2..2..2....1..2..1..0
..1..2..0..1....2..2..0..2....0..0..2..1....1..1..1..1....2..1..2..1
..2..2..0..0....2..0..0..0....2..2..2..2....2..2..1..2....0..2..0..2
..0..0..0..2....2..2..2..2....2..0..0..2....2..1..1..2....2..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 01 2012
STATUS
approved