A209373 Number of nX7 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z

185, 722, 5460, 54450, 510378, 4657352, 43249360, 402144800, 3725851316, 34509848328, 320002445430, 2967452389778, 27506545295520, 254980859279112, 2363917557528510, 21914994165576192, 203160244306365584

Offset

1,1

Comments

Column 7 of A209374

Links

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

Example

Some solutions for n=5
..1..3..2..2..1..3..1....1..3..2..2..1..3..2....1..2..2..3..1..2..1
..3..1..3..1..3..1..2....3..1..3..1..3..1..3....3..1..3..1..3..2..3
..2..2..1..3..1..3..1....2..3..1..3..1..2..1....1..3..1..2..1..3..1
..3..1..3..1..2..1..3....3..1..3..1..3..2..3....2..1..3..1..3..1..2
..1..3..1..3..1..3..2....1..3..2..3..1..3..1....1..3..1..3..1..3..2

Crossrefs

Sequence in context: A247529 A301991 A136048 * A207076 A189181 A203392

Adjacent sequences: A209370 A209371 A209372 * A209374 A209375 A209376

Keyword

nonn

Author

R. H. Hardin Mar 07 2012

Status

approved