A222762 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order

1, 3, 13, 465, 19766, 4479721, 1139211468, 1529339764557, 2262949907256195, 17477638597595547101, 147986778995780201368346, 6492535454463031607390365256

Offset

1,2

Comments

Diagonal of A222769

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A066266 A092845 A216474 * A290376 A089711 A374173

Adjacent sequences: A222759 A222760 A222761 * A222763 A222764 A222765

Keyword

nonn

Author

R. H. Hardin Mar 05 2013

Status

approved