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A222941
Number of nX3 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order
1
3, 33, 420, 5880, 82320, 1152480, 16134720, 225886080, 3162405120, 44273671680, 619831403520, 8677639649280, 121486955089920, 1700817371258880, 23811443197624320, 333360204766740480, 4667042866734366720
OFFSET
1,1
COMMENTS
Column 3 of A222944
LINKS
FORMULA
Empirical: a(n) = 14*a(n-1) for n>3
EXAMPLE
Some solutions for n=3
..0..1..1....0..1..2....0..0..1....0..1..2....0..1..2....0..1..2....0..1..2
..2..3..3....3..3..0....2..2..1....3..1..4....3..1..2....2..3..3....3..3..0
..4..0..0....1..2..4....1..3..3....4..2..0....2..4..0....1..0..0....1..4..0
CROSSREFS
Sequence in context: A299507 A294167 A009502 * A321265 A011922 A365028
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved