A194573 Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no element equal to more than two horizontal or vertical neighbors

1, 5, 194, 103442, 625181527, 26882336930339, 7006905313120058520, 10818569910116671839072764, 98751690024107856003006162934229

Offset

1,2

Comments

Column 5 of A194576

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for 3X3
..0......0......0......0......0......0......0......0......0......0......0
..0.1....1.2....1.0....1.2....1.2....1.2....1.2....1.1....1.0....1.1....1.2
..2.3.1..3.2.4..2.3.1..1.1.2..1.3.1..3.4.5..2.0.0..2.1.0..1.1.1..2.2.3..1.3.2

Crossrefs

Sequence in context: A093154 A194572 A068793 * A194574 A194575 A240772

Adjacent sequences: A194570 A194571 A194572 * A194574 A194575 A194576

Keyword

nonn

Author

R. H. Hardin Aug 29 2011

Status

approved