OFFSET
1,3
COMMENTS
Row 6 of A187286.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..50
FORMULA
Empirical: a(n) = 16752*n^2 - 101420*n + 136160 for n>9.
Conjectures from Colin Barker, Apr 22 2018: (Start)
G.f.: 4*x^3*(360 + 2776*x + 3834*x^2 + 1844*x^3 + 356*x^4 - 384*x^5 - 228*x^6 - 144*x^7 - 29*x^8 - 9*x^9) / (1 - x)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>12.
(End)
EXAMPLE
Some solutions for 4 X 4:
0 2 1 3 0 0 3 4 0 0 0 0 0 0 1 2 1 2 3 0
0 0 0 0 0 0 0 0 0 0 0 0 0 5 6 4 0 5 4 0
0 5 0 4 0 0 2 5 1 2 4 3 0 0 0 3 0 6 0 0
0 6 0 0 0 0 1 6 0 6 5 0 0 0 0 0 0 0 0 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2011
STATUS
approved