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A298221 T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 8

%I #4 Jan 15 2018 08:09:25

%S 1,2,2,4,7,4,8,13,13,8,16,29,20,29,16,32,73,40,40,73,32,64,157,89,120,

%T 89,157,64,128,353,195,503,503,195,353,128,256,869,451,1492,2066,1492,

%U 451,869,256,512,1993,1046,4767,6598,6598,4767,1046,1993,512,1024,4557,2453

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

%C Table starts

%C ...1....2....4.....8.....16......32.......64.......128........256.........512

%C ...2....7...13....29.....73.....157......353.......869.......1993........4557

%C ...4...13...20....40.....89.....195......451......1046.......2453........5810

%C ...8...29...40...120....503....1492.....4767.....17127......56292......185937

%C ..16...73...89...503...2066....6598....30780....125759.....498466.....2153157

%C ..32..157..195..1492...6598...25717...150617....749072....3768994....20393224

%C ..64..353..451..4767..30780..150617..1261845...8555774...57269902...425814658

%C .128..869.1046.17127.125759..749072..8555774..72407248..624571738..6148262835

%C .256.1993.2453.56292.498466.3768994.57269902.624571738.7205019743.93491026869

%H R. H. Hardin, <a href="/A298221/b298221.txt">Table of n, a(n) for n = 1..219</a>

%F Empirical for column k:

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

%F k=2: a(n) = 4*a(n-1) -5*a(n-2) +10*a(n-3) -24*a(n-4) +16*a(n-5) for n>6

%F k=3: [order 14] for n>15

%F k=4: [order 62] for n>65

%e Some solutions for n=6 k=4

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

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

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

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

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

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

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

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_, Jan 15 2018

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Last modified July 27 14:10 EDT 2024. Contains 374647 sequences. (Running on oeis4.)