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A210788 T(n,k)=Number of nXk 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z 9
4, 15, 15, 53, 176, 53, 170, 1533, 1533, 170, 497, 8824, 21379, 8824, 497, 1407, 40038, 142627, 142627, 40038, 1407, 3962, 167910, 748627, 1115472, 748627, 167910, 3962, 10867, 710895, 3846906, 8039420, 8039420, 3846906, 710895, 10867, 30956, 3139374 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

.....4......15........53.........170..........497..........1407..........3962

....15.....176......1533........8824........40038........167910........710895

....53....1533.....21379......142627.......748627.......3846906......23759000

...170....8824....142627.....1115472......8039420......69751928.....890122678

...497...40038....748627.....8039420.....98861559....1663213556...37591420090

..1407..167910...3846906....69751928...1663213556...51104966068.1928958791380

..3962..710895..23759000...890122678..37591420090.1928958791380

.10867.3139374.197838865.13542249784.889827826226

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

EXAMPLE

Some solutions for n=4 k=3

..1..2..2....2..3..4....2..4..4....1..3..1....4..2..4....1..4..4....2..2..1

..3..1..4....3..4..2....2..3..4....4..1..2....4..4..3....2..2..4....1..3..3

..4..3..4....1..3..4....3..4..2....4..3..2....2..3..1....3..3..3....4..3..2

..1..2..3....4..1..3....1..3..1....1..4..3....3..1..2....1..3..2....2..1..4

CROSSREFS

Sequence in context: A095331 A163773 A306825 * A229412 A076349 A175959

Adjacent sequences:  A210785 A210786 A210787 * A210789 A210790 A210791

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 26 2012

STATUS

approved

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Last modified November 21 11:35 EST 2019. Contains 329370 sequences. (Running on oeis4.)