OFFSET
1,1
COMMENTS
Column 2 of A251459
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-1) +198*a(n-2) -3198*a(n-3) -7812*a(n-4) +184871*a(n-5) +31578*a(n-6) -4565501*a(n-7) +3558194*a(n-8) +55101117*a(n-9) -72502119*a(n-10) -332701010*a(n-11) +567941512*a(n-12) +935596488*a(n-13) -2005944144*a(n-14) -945330624*a(n-15) +3100461624*a(n-16) -208714144*a(n-17) -1639102944*a(n-18) +397924992*a(n-19) +157598784*a(n-20) -32192640*a(n-21) -3359232*a(n-22)
EXAMPLE
Some solutions for n=3
..0..0..0....2..3..1....0..2..3....0..3..2....0..0..3....2..2..1....2..1..2
..2..3..0....0..2..1....2..3..3....1..1..1....3..0..0....3..0..2....2..0..0
..2..0..2....1..0..2....1..1..0....0..1..0....0..2..0....0..0..0....0..3..0
..3..0..1....0..1..2....0..0..1....1..1..1....3..2..3....3..2..3....0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2014
STATUS
approved