OFFSET
1,1
COMMENTS
Row 5 of A188236.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) - a(n-3) - 2*a(n-5) + 2*a(n-6) + a(n-8) - 2*a(n-10) + a(n-11).
Empirical g.f.: x*(58 + 3*x - 17*x^2 - 10*x^3 - 31*x^4 + 44*x^5 + 7*x^6 + 20*x^7 - 13*x^8 - 37*x^9 + 22*x^10) / ((1 - x)^5*(1 + x)^2*(1 + x^2)*(1 + x + x^2)). - Colin Barker, Apr 27 2018
EXAMPLE
Some solutions for n=4:
.-4...-4...-7...-3...-7...-5...-5...-7...-3...-4...-4...-6...-5...-3...-4...-5
.-2...-3...-1...-1...-6...-3...-2...-6...-3...-2...-1...-4...-1...-2...-4...-1
.-2...-3....1....0....1....0...-1....1...-1...-1....1....3...-1...-1....1....0
..4....3....2....1....5....3....1....6....1....1....2....3....0....0....3....0
..4....7....5....3....7....5....7....6....6....6....2....4....7....6....4....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 24 2011
STATUS
approved