A222746 Number of nX7 0..3 arrays with exactly floor(nX7/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

70, 1710608, 20825891902, 294955698998860, 3555678098386103283, 53383470246573011524686, 654193205170812775084974847, 10103355634312544389080282332563, 125051109525561104506969445492198468

Offset

1,1

Comments

Column 7 of A222747

Links

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

Example

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

Crossrefs

Sequence in context: A172759 A172829 A228521 * A066789 A103165 A390782

Adjacent sequences: A222743 A222744 A222745 * A222747 A222748 A222749

Keyword

nonn

Author

R. H. Hardin, Mar 04 2013

Status

approved