OFFSET
1,1
COMMENTS
Column 3 of A209465
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 172*a(n-1) -8737*a(n-2) +125848*a(n-3) +1640003*a(n-4) -58941308*a(n-5) +441046249*a(n-6) +799433456*a(n-7) -23572369886*a(n-8) +84702514904*a(n-9) +67645214404*a(n-10) -904101250144*a(n-11) +1363565491464*a(n-12) +425476260576*a(n-13) -2084864162400*a(n-14) +1100743344000*a(n-15) -104976000000*a(n-16) for n>17
EXAMPLE
Some solutions for n=4
..0..0..0....0..1..0....0..0..1....0..1..1....0..0..0....0..0..0....0..0..0
..1..2..1....0..2..0....1..2..2....0..2..0....1..2..1....1..2..3....1..2..1
..3..1..0....0..3..3....0..0..1....0..1..0....3..3..3....0..0..0....0..0..2
..0..1..2....0..1..0....1..2..0....0..2..2....4..5..1....4..2..4....1..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2012
STATUS
approved