OFFSET
1,1
COMMENTS
Column 3 of A210267
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 63*a(n-1) -318*a(n-2) -15234*a(n-3) +103150*a(n-4) +1267432*a(n-5) -7283556*a(n-6) -49152712*a(n-7) +160312712*a(n-8) +877545008*a(n-9) -931302192*a(n-10) -5537877952*a(n-11) +2212548864*a(n-12) +14304785408*a(n-13) -4034892800*a(n-14) -15800012800*a(n-15) +5312643072*a(n-16) +6186336256*a(n-17) -2686451712*a(n-18)
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..0..0..0....0..0..0..0....0..1..0..2....0..0..0..0
..1..2..3..0....1..2..1..3....1..2..3..2....1..3..3..2....1..2..1..2
..3..1..1..3....1..0..0..1....2..3..0..2....2..1..2..0....2..3..1..3
..2..2..3..0....0..2..3..3....1..3..2..1....1..3..1..0....1..3..2..3
..3..0..3..1....1..1..1..0....3..0..0..1....1..0..3..3....1..0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2012
STATUS
approved