OFFSET
1,1
COMMENTS
Column 5 of A252407
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 65*a(n-3) -1346*a(n-6) +14351*a(n-9) -132847*a(n-12) +835969*a(n-15) -4209768*a(n-18) +15460044*a(n-21) -39702866*a(n-24) +78620670*a(n-27) -89680096*a(n-30) -17754183*a(n-33) +155129092*a(n-36) -76681288*a(n-39) -94771951*a(n-42) +63825249*a(n-45) +45921910*a(n-48) -45180122*a(n-51) -698090*a(n-54) +12346433*a(n-57) -3239461*a(n-60) -160991*a(n-63) +116821*a(n-66) -61167*a(n-69) +2548*a(n-72) +968*a(n-75) +56*a(n-78) +2*a(n-81) -a(n-84) for n>87
EXAMPLE
Some solutions for n=4
..3..2..2..3..2..2..0....0..2..2..0..2..2..3....2..3..2..2..3..2..2
..3..1..3..3..1..3..3....2..3..2..2..3..2..2....3..0..1..3..3..1..0
..2..2..0..2..2..3..2....3..3..1..3..0..1..3....3..2..2..3..2..2..3
..3..2..2..3..2..2..3....3..2..2..3..2..2..3....2..3..2..2..3..2..2
..3..1..3..3..1..3..3....2..0..2..2..3..2..2....3..3..1..3..0..1..3
..2..2..3..2..2..3..2....3..3..1..0..3..1..3....0..2..2..3..2..2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved