OFFSET
1,1
COMMENTS
Column 3 of A209527
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 272*a(n-1) -24648*a(n-2) +828436*a(n-3) +149527*a(n-4) -622108500*a(n-5) +12598172586*a(n-6) -33558174264*a(n-7) -1578553176492*a(n-8) +17819275800656*a(n-9) -28667330106760*a(n-10) -594252767603616*a(n-11) +3792849444610432*a(n-12) -4923895161267584*a(n-13) -25653638667831936*a(n-14) +97101168572132352*a(n-15) -88244422976636928*a(n-16) -79190406866239488*a(n-17) +174755710679777280*a(n-18) -81018004244004864*a(n-19) +7489524376535040*a(n-20) for n>21
EXAMPLE
Some solutions for n=5
..0..0..0....0..0..1....0..0..0....0..0..0....0..0..1....0..1..0....0..0..0
..1..2..1....1..2..2....1..2..1....1..2..1....2..1..3....0..2..1....1..2..1
..0..0..1....0..0..1....3..2..3....0..0..0....3..1..0....0..1..0....0..0..0
..1..2..0....1..2..0....0..0..0....1..2..1....0..0..2....0..2..1....1..2..1
..0..0..1....2..0..1....1..2..1....3..2..3....1..2..1....1..1..0....3..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved