OFFSET
1,1
COMMENTS
Column 3 of A250419
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 12*a(n-1) -23*a(n-2) -252*a(n-3) +1056*a(n-4) +1766*a(n-5) -14214*a(n-6) -1040*a(n-7) +103693*a(n-8) -58064*a(n-9) -484016*a(n-10) +411280*a(n-11) +1566651*a(n-12) -1472256*a(n-13) -3670072*a(n-14) +3223960*a(n-15) +6306524*a(n-16) -4463544*a(n-17) -7823016*a(n-18) +3799616*a(n-19) +6723120*a(n-20) -1817056*a(n-21) -3791856*a(n-22) +352032*a(n-23) +1315312*a(n-24) +57408*a(n-25) -252160*a(n-26) -37120*a(n-27) +20352*a(n-28) +4608*a(n-29)
EXAMPLE
Some solutions for n=6
..2....2....1....3....2....3....2....3....0....1....3....0....1....2....0....1
..1....0....3....2....1....0....3....2....1....1....2....0....2....2....2....1
..3....2....3....0....1....1....1....3....3....3....0....1....3....0....1....1
..1....0....0....0....3....0....3....3....1....1....0....3....2....1....2....2
..0....2....2....0....2....0....0....3....1....1....3....1....1....2....2....0
..1....0....1....2....3....0....3....2....2....0....1....0....2....1....3....1
..2....3....1....2....1....1....0....0....2....0....3....3....1....0....2....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 22 2014
STATUS
approved