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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 September 27 01:46 EDT 2023. Contains 365669 sequences. (Running on oeis4.)