The OEIS is supported by the many generous donors to the OEIS Foundation.

Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

1

`%I #4 Feb 25 2013 11:49:57
`

`%S 4,18,112,1087,11442,128213,1471412,17068476,198654710,2328829654,
`

`%T 27335961632,322535055233,3807753230632,45124599083917,
`

`%U 535113331694641,6363369440619695,75729209656948170,903078623804307816
`

`%N Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
`

`%C Column 4 of A222587
`

`%H R. H. Hardin, <a href="/A222584/b222584.txt">Table of n, a(n) for n = 1..83</a>
`

`%e Some solutions for n=3
`

`%e ..0..1..1..1....0..0..0..0....0..1..1..1....0..0..0..0....0..0..0..1
`

`%e ..2..1..1..1....1..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0
`

`%e ..0..1..1..1....0..2..0..0....0..1..1..1....0..0..0..1....0..0..0..0
`

`%K nonn
`

`%O 1,1
`

`%A _R. H. Hardin_ Feb 25 2013
`