A222749 Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 6, 32, 657, 7546, 124363, 1710608, 26389570, 386047246, 5871176993, 88003925336, 1338216528014, 20289648960772, 309520117240045, 4723512898829824, 72313201073502649, 1108352818885158958

Offset

1,2

Comments

Row 2 of A222747

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Example

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

Crossrefs

Sequence in context: A296314 A222605 A290790 * A132548 A140521 A171141

Adjacent sequences: A222746 A222747 A222748 * A222750 A222751 A222752

Keyword

nonn

Author

R. H. Hardin Mar 04 2013

Status

approved