A203842 Number of nX4 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 50, 2706, 84346, 2507842, 83049596, 2828543595, 95696351404, 3237561922069, 109915983761733, 3737520454582311, 127129254610881462, 4325197729686697158, 147185372366419480113, 5009327110121467821581, 170498121168210026695996

Offset

1,2

Comments

Column 4 of A203846

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..2..3..3....2..2..0..0....2..2..3..3....3..3..3..1....1..1..0..0
..3..3..3..3....2..2..0..0....2..0..3..3....3..0..3..3....1..1..3..3
..3..2..0..3....0..3..3..1....2..2..0..1....3..0..0..3....0..3..3..3
..3..3..3..3....0..3..3..1....2..2..1..1....3..3..3..3....0..3..3..1

Crossrefs

Sequence in context: A165800 A042201 A097838 * A251058 A239653 A223661

Adjacent sequences: A203839 A203840 A203841 * A203843 A203844 A203845

Keyword

nonn

Author

R. H. Hardin Jan 06 2012

Status

approved