OFFSET
1,1
COMMENTS
Column 1 of A238054
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2528*a(n-4) -63488*a(n-8) +315392*a(n-12) +147456*a(n-16) +4194304*a(n-20) for n>21
EXAMPLE
Some solutions for n=4
..1..0....3..0....3..0....2..2....0..2....3..3....2..3....0..2....3..0....1..0
..3..3....2..1....0..1....0..0....0..0....1..1....0..0....2..3....1..3....2..2
..0..2....0..0....3..1....2..1....2..1....0..3....3..1....0..1....1..3....3..3
..3..2....1..1....0..0....0..3....1..0....1..2....1..2....2..0....0..3....1..2
..3..2....1..2....1..2....1..1....3..3....0..2....1..0....3..1....3..2....3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 17 2014
STATUS
approved