OFFSET
1,1
COMMENTS
Column 1 of A237299
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 18*a(n-1) -80*a(n-2) -356*a(n-3) +3712*a(n-4) -3672*a(n-5) -46200*a(n-6) +121376*a(n-7) +223024*a(n-8) -1056416*a(n-9) -188480*a(n-10) +4472000*a(n-11) -2103552*a(n-12) -10322304*a(n-13) +8097920*a(n-14) +13459968*a(n-15) -12348928*a(n-16) -9893888*a(n-17) +8663040*a(n-18) +3891200*a(n-19) -2293760*a(n-20) -655360*a(n-21)
EXAMPLE
Some solutions for n=5
..0..3....0..2....2..2....0..0....2..1....2..3....0..0....2..2....0..2....0..3
..1..1....1..2....3..0....0..1....2..1....1..3....1..1....3..3....1..2....3..1
..3..0....0..2....1..3....1..3....0..1....0..3....0..2....2..2....2..2....3..2
..1..1....2..1....2..3....1..2....2..1....3..1....1..3....1..1....3..0....3..3
..2..1....3..3....2..0....0..0....0..1....2..3....0..2....1..1....1..3....3..2
..0..0....1..0....1..2....1..0....0..1....0..2....1..1....1..1....3..2....3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 06 2014
STATUS
approved