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A222893
Number of nX4 0..7 arrays with no element equal to another at a city block distance of exactly two, and new values 0..7 introduced in row major order
0
7, 389, 84521, 46407465, 30122054696, 20029573364121, 13364073847082009, 8921070496957305924
OFFSET
1,1
COMMENTS
Column 4 of A222894
EXAMPLE
Some solutions for n=3
..0..1..2..3....0..1..1..2....0..1..1..2....0..1..2..2....0..1..2..3
..3..4..4..5....3..3..4..4....3..4..5..5....3..1..4..3....4..1..5..6
..2..2..1..1....1..5..5..1....5..2..6..7....4..2..0..3....7..6..4..2
CROSSREFS
Sequence in context: A058275 A184954 A185354 * A009712 A128793 A042527
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 08 2013
STATUS
approved