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

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A222938 A222939 A222940 * A222942 A222943 A222944

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved