OFFSET
1,1
COMMENTS
Row 4 of A201042.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (29/4)*n^4 + (29/2)*n^3 + (51/4)*n^2 + (11/2)*n + 1.
Conjectures from Colin Barker, May 21 2018: (Start)
G.f.: x*(41 + 90*x + 46*x^2 - 4*x^3 + x^4) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
(End)
EXAMPLE
Some solutions for n=7:
..5...-5...-6...-2....2....3....1....5...-6...-3...-3....1....4...-2...-1...-1
.-1...-2...-3....3...-2...-2...-5...-1....0...-3....0....7...-3...-4...-5...-3
..2....2....4....2...-1...-5....1....1...-4....2...-1....2....2...-4...-2...-7
..1...-2....0....0....4....1....3...-1...-1....1....6...-4....6....2...-2...-1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 26 2011
STATUS
approved