A222452 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order

3, 7, 17, 101, 426, 1722, 8483, 46788, 246899, 1263032, 6568737, 34802586, 184657217, 976867173, 5178449568, 27557967928, 146974586179, 784645686795, 4194027064034, 22450449919571, 120330101083792, 645608703621958

Offset

1,1

Comments

Column 4 of A222456

Links

R. H. Hardin, Table of n, a(n) for n = 1..204

Example

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

Crossrefs

Sequence in context: A128343 A106877 A041949 * A218165 A102329 A331713

Adjacent sequences: A222449 A222450 A222451 * A222453 A222454 A222455

Keyword

nonn

Author

R. H. Hardin Feb 20 2013

Status

approved