OFFSET
1,1
COMMENTS
Column 7 of A254827
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 24*a(n-4) +1210*a(n-5) +11567*a(n-6) +53545*a(n-7) +155565*a(n-8) +319478*a(n-9) +493380*a(n-10) +590848*a(n-11) +555252*a(n-12) +410274*a(n-13) +238255*a(n-14) +109308*a(n-15) +40497*a(n-16) +12746*a(n-17) +3661*a(n-18) +995*a(n-19) +240*a(n-20) +43*a(n-21) +4*a(n-22)
EXAMPLE
Some solutions for n=4
..5....2....5....3....2....4....5....6....8....3....4....6....2....4....4....3
..4....7....3....5....8....4....5....6....1....1....6....3....1....2....2....1
..6....3....4....1....5....8....6....8....5....5....6....5....3....8....6....4
..3....6....4....6....3....6....2....5....2....5....6....8....2....8....2....4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2015
STATUS
approved