A222879 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

2, 11, 122, 1814, 26311, 399849, 6013669, 91842381, 1400573929, 21492587457, 330100781811, 5085688832352, 78450837933529, 1212393597214424, 18758126651572197, 290589347000277975, 4505965014075887115

Offset

1,1

Comments

Row 2 of A222878

Links

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

Example

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

Crossrefs

Sequence in context: A346650 A251663 A118794 * A354978 A247736 A155928

Adjacent sequences: A222876 A222877 A222878 * A222880 A222881 A222882

Keyword

nonn

Author

R. H. Hardin Mar 08 2013

Status

approved