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A300215 T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 7

%I #4 Feb 28 2018 14:22:54

%S 1,2,2,4,8,4,8,32,32,8,16,128,228,128,16,32,512,1651,1651,512,32,64,

%T 2048,11965,22194,11965,2048,64,128,8192,86775,298600,298600,86775,

%U 8192,128,256,32768,629440,4023881,7452385,4023881,629440,32768,256,512,131072

%N T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Table starts

%C ...1......2........4..........8............16..............32

%C ...2......8.......32........128...........512............2048

%C ...4.....32......228.......1651.........11965...........86775

%C ...8....128.....1651......22194........298600.........4023881

%C ..16....512....11965.....298600.......7452385.......186427449

%C ..32...2048....86775....4023881.....186427449......8664017314

%C ..64...8192...629440...54246856....4666136435....402932952786

%C .128..32768..4566023..731384148..116802113451..18741286700978

%C .256.131072.33122989.9861234001.2923892905217.871742323938453

%H R. H. Hardin, <a href="/A300215/b300215.txt">Table of n, a(n) for n = 1..180</a>

%F Empirical for column k:

%F k=1: a(n) = 2*a(n-1)

%F k=2: a(n) = 4*a(n-1)

%F k=3: [order 8]

%F k=4: [order 24]

%F k=5: [order 89]

%e Some solutions for n=5 k=4

%e ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..0..0

%e ..0..1..0..1. .0..0..1..1. .1..1..1..1. .1..1..0..1. .0..1..0..0

%e ..0..0..1..0. .1..0..1..0. .1..0..1..1. .1..1..0..1. .1..1..1..0

%e ..0..1..1..0. .0..0..1..0. .0..0..0..0. .0..0..0..1. .0..1..1..1

%e ..0..0..1..1. .0..0..0..0. .0..0..1..0. .1..0..0..0. .0..0..1..0

%Y Column 1 is A000079(n-1).

%Y Column 2 is A004171(n-1).

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_, Feb 28 2018

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Last modified April 16 13:53 EDT 2024. Contains 371726 sequences. (Running on oeis4.)