A222691 - OEIS

A222691

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

0, 3, 4, 18, 56, 237, 784, 3218, 11152, 45290, 161696, 650010, 2372368, 9467136, 35149184, 139387576, 524385184, 2070069588, 7866603584, 30953957824, 118536117440, 465439834288, 1792785588096, 7030514425512, 27200880331136

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OFFSET

1,2

COMMENTS

Row 2 of A222690

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..88

EXAMPLE

All solutions for n=3

..0..0..1....0..0..0....0..0..0....0..0..1

..0..0..0....1..0..0....0..1..1....1..1..1

CROSSREFS