A216932 Number of side-n hexagonal 0..3 arrays with values nondecreasing E, SW and SE.

4, 200, 17336, 1664244, 161114424, 15316983096, 1419691311304, 128192490487336, 11293174782625768, 972723674586291992, 82102763053800998896, 6805147718234252844940, 554951326868228481044896

Offset

1,1

Comments

Column 3 of A216937.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for n=3
......0.0.0..........0.0.1..........0.0.1..........0.1.1..........0.0.0
.....0.0.0.1........0.0.1.1........0.0.1.2........0.1.1.1........0.1.1.3
....0.1.1.1.1......1.1.1.3.3......0.0.1.2.3......1.1.1.1.3......0.1.1.3.3
.....1.2.2.3........2.2.3.3........2.2.3.3........1.2.2.3........1.2.3.3
......2.3.3..........2.3.3..........3.3.3..........3.3.3..........3.3.3

Crossrefs

Cf. A216937.

Sequence in context: A356214 A034862 A174776 * A317273 A049656 A129465

Adjacent sequences: A216929 A216930 A216931 * A216933 A216934 A216935

Keyword

nonn

Author

R. H. Hardin, Sep 20 2012

Status

approved