OFFSET
1,1
COMMENTS
Row 7 of A246737
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..56
FORMULA
Empirical: a(n) = 3*a(n-1) +6*a(n-2) -26*a(n-3) -9*a(n-4) +99*a(n-5) -24*a(n-6) -216*a(n-7) +126*a(n-8) +294*a(n-9) -252*a(n-10) -252*a(n-11) +294*a(n-12) +126*a(n-13) -216*a(n-14) -24*a(n-15) +99*a(n-16) -9*a(n-17) -26*a(n-18) +6*a(n-19) +3*a(n-20) -a(n-21)
EXAMPLE
Some solutions for n=4
..2....2....0....1....1....0....2....3....0....0....3....2....1....1....2....0
..1....0....2....2....4....1....3....2....1....2....0....3....1....0....0....0
..1....0....1....1....4....2....0....4....0....1....0....3....1....1....0....0
..0....1....1....1....1....0....3....3....1....1....0....4....1....0....0....0
..1....1....1....4....4....1....0....3....0....1....0....3....1....2....0....0
..2....0....0....4....1....1....3....3....1....1....0....3....1....0....1....0
..0....2....1....4....1....1....3....2....0....1....0....4....0....0....1....0
..1....1....1....1....2....1....3....3....0....0....1....3....1....1....1....0
..1....1....2....4....1....0....3....4....0....1....1....4....1....0....1....3
..0....0....0....1....1....2....4....3....0....0....2....4....0....0....2....3
..2....0....1....2....0....1....3....3....3....2....1....2....1....2....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 02 2014
STATUS
approved