OFFSET
1,1
COMMENTS
Column 5 of A251950
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 69*a(n-3) -1170*a(n-6) +2238*a(n-9) -57909*a(n-12) +222992*a(n-15) -1407264*a(n-18) +4017948*a(n-21) -19586465*a(n-24) +37664446*a(n-27) -93459214*a(n-30) +89190666*a(n-33) -1008083*a(n-36) -13979004*a(n-39) -3987484*a(n-42) +2116364*a(n-45) +401146*a(n-48) -128423*a(n-51) -852*a(n-54) for n>57
EXAMPLE
Some solutions for n=4
..1..1..0..1..1..0..1....2..0..0..2..3..0..2....1..1..0..1..1..3..1
..3..0..2..3..0..2..0....3..1..1..0..1..1..0....1..1..3..1..1..0..1
..1..1..0..1..1..0..1....0..1..1..3..1..1..0....0..0..2..0..3..2..0
..1..1..0..1..1..0..1....2..3..0..2..0..0..2....1..1..0..1..1..0..1
..0..0..2..3..0..2..3....0..1..1..0..1..1..0....1..1..0..1..1..0..1
..1..1..0..1..1..3..3....3..1..1..0..1..1..0....0..3..2..0..0..2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 11 2014
STATUS
approved