A206385 Number of n X 4 0..6 arrays with no element equal to another within a city block distance of two, and new values 0..6 introduced in row major order.

2, 33, 1368, 67716, 3328979, 164270604, 8094257014, 399073153303, 19671060879306, 969710249315342, 47801400299066037, 2356379708874988482, 116157573684573753928, 5725991875022057193833, 282262740672653624738188, 13914145046466342831542252, 685897849965998299017561091

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=4:
..0..1..2..0....0..1..2..3....0..1..2..3....0..1..2..3....0..1..2..0
..2..3..4..5....3..4..5..6....2..3..4..5....2..3..4..5....2..3..4..5
..1..5..6..3....6..2..0..1....1..5..6..0....4..5..0..6....5..6..0..1
..0..2..1..4....0..1..3..2....3..4..1..2....6..1..3..4....4..1..5..6

Crossrefs

Column 4 of A206389.

Sequence in context: A204239 A198901 A242621 * A387744 A263052 A090335

Adjacent sequences: A206382 A206383 A206384 * A206386 A206387 A206388

Keyword

nonn

Author

R. H. Hardin, Feb 07 2012

Status

approved