OFFSET
1,1
COMMENTS
Column 1 of A223467.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 20*a(n-2) -126*a(n-4) +304*a(n-6) -252*a(n-8) +80*a(n-10) -8*a(n-12).
EXAMPLE
Some solutions for n=3
..1...15...11....1...11....6...12....7....4....4....8....9....1....2....7...13
..0...10....7....3...16...11...18...11....8....8....5....5....3....4....4...19
..2...15...11....6...10....6...13....7...12....5....9....9....1....8....2...14
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved