A222667 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 0, 2, 9, 24, 80, 288, 1038, 3608, 12696, 45024, 160364, 571200, 2039424, 7297632, 26163672, 93938304, 337754400, 1215965472, 4382841504, 15814326912, 57117508992, 206479723776, 747042295968, 2704860854400, 9800596459776

Offset

1,3

Comments

Column 2 of A222673

Links

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

Example

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

Crossrefs

Sequence in context: A275260 A248436 A354016 * A122006 A200086 A143561

Adjacent sequences: A222664 A222665 A222666 * A222668 A222669 A222670

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved