A206389 T(n,k)=Number of nXk 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.

1, 1, 1, 1, 1, 1, 2, 4, 4, 2, 5, 33, 55, 33, 5, 15, 380, 1368, 1368, 380, 15, 52, 4801, 34442, 67716, 34442, 4801, 52, 202, 62004, 868994, 3328979, 3328979, 868994, 62004, 202, 855, 804833, 21916090, 164270604, 319902496, 164270604, 21916090, 804833, 855

Offset: 1

Author

R. H. Hardin Feb 07 2012

Keywords

• nonn
• tabl

Comments

Table starts

...1......1.........1..........2...........5..........15............52

...1......1.........4.........33.........380........4801.........62004

...1......4........55.......1368.......34442......868994......21916090

...2.....33......1368......67716.....3328979...164270604....8094257014

...5....380.....34442....3328979...319902496.30809397399.2965468376203

..15...4801....868994..164270604.30809397399

..52..62004..21916090.8094257014

.202.804833.552801398

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..60

Crossrefs

Column 1 is A056272(n-2)

Column 2 is A198900(n-1)