OFFSET
1,1
COMMENTS
Column 3 of A205431.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +1437*a(n-2) -1436*a(n-3) -73559*a(n-4) +137575*a(n-5) +1288600*a(n-6) -3105933*a(n-7) -2093681*a(n-8) +2368404*a(n-9) -65489997*a(n-10) +236894949*a(n-11) +346457313*a(n-12) -1484643168*a(n-13) -128120832*a(n-14) +2924517312*a(n-15) -2128639824*a(n-16) +1119744*a(n-17) +2855067264*a(n-18) -4073488704*a(n-19) +1273568832*a(n-20) +272097792*a(n-21) for n>22.
EXAMPLE
Some solutions for n=4:
..0..0..0..0....0..0..0..0....0..1..0..2....0..0..1..0....0..0..1..1
..0..0..1..2....0..1..1..0....2..1..1..2....0..1..0..3....1..0..1..0
..2..0..1..1....1..0..1..2....2..2..2..3....3..1..1..1....1..0..0..1
..1..1..2..2....1..1..0..1....1..3..2..0....1..3..2..1....3..1..1..1
..3..1..3..2....0..0..2..1....3..3..0..2....1..2..3..3....1..3..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2012
STATUS
approved