A223001 Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order

2, 7, 45, 272, 1814, 12742, 87682, 608358, 4249808, 29840968, 210352688, 1488131168, 10553965640, 75038380408, 534638034296, 3816328740984, 27285917390928, 195374729171232, 1400767518477984, 10054924676368736

Offset

1,1

Comments

Row 2 of A223000

Links

R. H. Hardin, Table of n, a(n) for n = 1..160

Example

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

Crossrefs

Sequence in context: A108240 A064606 A331711 * A066612 A098637 A162045

Adjacent sequences: A222998 A222999 A223000 * A223002 A223003 A223004

Keyword

nonn

Author

R. H. Hardin Mar 11 2013

Status

approved