OFFSET
1,1
COMMENTS
Column 6 of A228260
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..62
FORMULA
Empirical: a(n) = 13*a(n-1) -42*a(n-2) for n>12
EXAMPLE
Some solutions for n=4
.-4...-7...-4...-7...-4..-18..-10..-11..-14...-9...-6...-8..-13...-9..-12...-8
-10....0...-6....5..-10...18...-1...11....5....4...-2...18....5...18...22...-1
.16....2....2...-5...19...-3....7...-7...-4...10....0..-22....7..-18..-20....9
-14...-2....7....3..-16..-10...-5....3....2..-16...10...21..-10....5....7..-11
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 19 2013
STATUS
approved