A206503 T(n,k)=Number of nXk 0..7 arrays with no element equal to another within a city block distance of two, and new values 0..7 introduced in row major order.

1, 1, 1, 1, 1, 1, 2, 4, 4, 2, 5, 34, 65, 34, 5, 15, 481, 3130, 3130, 481, 15, 52, 8731, 178998, 502599, 178998, 8731, 52, 203, 174454, 10502458, 83045488, 83045488, 10502458, 174454, 203, 876, 3603244, 618242826, 13752277898, 38638317841, 13752277898

Offset: 1

Author

R. H. Hardin Feb 08 2012

Keywords

• nonn
• tabl

Comments

Table starts

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

...1.......1.........4..........34.........481........8731........174454

...1.......4........65........3130......178998....10502458.....618242826

...2......34......3130......502599....83045488.13752277898.2277207309720

...5.....481....178998....83045488.38638317841

..15....8731..10502458.13752277898

..52..174454.618242826

.203.3603244

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....3..4..5....2..3..0....2..3..4....2..3..0....2..3..0....3..4..0
..1..4..5....5..2..1....1..4..5....4..5..6....4..5..6....4..5..1....2..5..1
..5..0..1....6..7..3....5..2..1....6..1..7....6..7..1....3..0..6....0..3..6
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..49

Crossrefs

Column 1 is A056273(n-2)

Column 2 is A198976(n-1)