OFFSET
1,1
COMMENTS
Column 5 of A206383
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..72
FORMULA
Empirical: a(n) = 394*a(n-1) -38562*a(n-2) +1246392*a(n-3) +6334675*a(n-4) -1215511426*a(n-5) +25096715040*a(n-6) -111433495776*a(n-7) -2633554263696*a(n-8) +38447016473440*a(n-9) -124529929487104*a(n-10) -973109346072576*a(n-11) +8528195948079360*a(n-12) -13461810857735680*a(n-13) -67310021223342080*a(n-14) +238037998037753856*a(n-15) +44544280591749120*a(n-16) -947327372288188416*a(n-17) +643157082054918144*a(n-18) +987246769084563456*a(n-19) -892353207989698560*a(n-20)
EXAMPLE
Some solutions for n=4
..0..0..0..0..1..2....0..0..0..0..0..0....0..0..0..0..1..1....0..1..2..1..1..0
..3..3..1..3..3..0....0..0..0..0..0..0....0..2..0..1..1..0....0..1..0..3..2..2
..1..2..0..2..1..2....0..0..0..0..0..0....2..2..2..0..1..1....2..1..0..3..0..1
..1..2..1..2..1..3....0..0..0..0..0..0....0..2..0..0..0..1....0..1..0..3..2..2
..3..2..3..0..0..2....0..0..0..0..0..0....2..1..2..0..1..1....2..1..2..3..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 07 2012
STATUS
approved