login
A215177
Number of nXnXn triangular 0..3 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value
1
4, 6, 12, 26, 80, 328, 1584, 9026, 67628, 563302, 5744464, 69602320, 978445100, 15683210094, 298177611420, 6263302797142, 150331850790260, 4059073224267052, 121773216004382260, 4018526320908322098, 148685575801244993376
OFFSET
1,1
COMMENTS
Column 3 of A215182
LINKS
EXAMPLE
Some solutions for n=4
.....0........1........1........1........2........2........1........1
....0.0......0.2......1.1......0.2......2.2......1.3......0.2......0.2
...0.0.0....0.1.2....1.1.1....0.0.3....1.2.3....1.2.3....0.1.2....0.1.2
..0.0.0.0..0.0.1.3..0.0.1.3..0.0.1.3..1.2.2.3..1.2.2.3..0.1.1.2..0.0.2.2
CROSSREFS
Sequence in context: A090608 A197467 A256350 * A294489 A344995 A115076
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 05 2012
STATUS
approved