A222848 Number of nX1 0..2 arrays with no more than floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

1, 1, 2, 10, 24, 72, 168, 664, 1632, 5376, 13152, 47968, 119936, 406400, 1017984, 3585408, 9082368, 30987264, 78761472, 272565760, 697493504, 2378450944, 6107523072, 20921604096, 53972262912, 183506403328, 474876108800

Offset

1,3

Comments

Column 1 of A222853

Links

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

Example

All solutions for n=3
..0....0
..1....1
..2....0

Crossrefs

Sequence in context: A130016 A120550 A233266 * A119062 A270822 A248117

Adjacent sequences: A222845 A222846 A222847 * A222849 A222850 A222851

Keyword

nonn

Author

R. H. Hardin Mar 07 2013

Status

approved