OFFSET
1,1
COMMENTS
Column 7 of A248537
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +12*a(n-4) -12*a(n-5) -47*a(n-8) +47*a(n-9) +81*a(n-12) -81*a(n-13) -76*a(n-16) +76*a(n-17) +36*a(n-20) -36*a(n-21) -8*a(n-24) +8*a(n-25)
EXAMPLE
Some solutions for n=6
..4....0....0....4....1....7....2....5....2....3....3....7....3....1....4....6
..4....3....3....5....2....0....0....3....6....5....6....0....1....3....7....3
..5....3....5....3....0....5....2....4....4....4....5....4....4....5....3....3
..3....6....4....4....5....4....4....4....4....4....6....5....4....3....2....4
..0....4....4....4....1....3....2....1....2....3....7....3....7....1....4....2
..4....3....7....1....2....4....0....3....6....5....6....4....5....3....3....3
..5....3....5....7....0....5....2....4....4....4....5....4....0....5....3....3
..3....6....0....4....1....0....4....4....4....0....2....1....4....3....6....0
..0....4....4....4....5....7....2....5....2....7....7....7....7....1....4....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 08 2014
STATUS
approved