OFFSET
1,2
COMMENTS
Row 3 of A187162.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..50
FORMULA
Empirical: a(n) = 30*n^3 - 60*n^2 + 24*n for n>1.
Conjectures from Colin Barker, Apr 20 2018: (Start)
G.f.: 6*x^2*(8 + 25*x - 4*x^2 + x^3) / (1 - x)^4.
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n>5.
(End)
EXAMPLE
A solution for 2 X 2 X 2:
..0..0.....0..0
..1..2.....0..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 06 2011
STATUS
approved