login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A316239 T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero. 7

%I #4 Jun 27 2018 15:35:00

%S 1,2,2,3,5,3,5,9,9,5,8,21,14,21,8,13,57,29,29,57,13,21,125,71,105,71,

%T 125,21,34,289,153,365,365,153,289,34,55,741,358,1135,1867,1135,358,

%U 741,55,89,1737,956,4802,6518,6518,4802,956,1737,89,144,4045,2612,21363,41303

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

%C Table starts

%C ..1....2....3.....5.......8.......13.........21...........34............55

%C ..2....5....9....21......57......125........289..........741..........1737

%C ..3....9...14....29......71......153........358..........956..........2612

%C ..5...21...29...105.....365.....1135.......4802........21363.........89321

%C ..8...57...71...365....1867.....6518......41303.......312366.......1912290

%C .13..125..153..1135....6518....42075.....496125......5256306......54317972

%C .21..289..358..4802...41303...496125...10057887....174856739....2842217588

%C .34..741..956.21363..312366..5256306..174856739...5109468434..127247367597

%C .55.1737.2612.89321.1912290.54317972.2842217588.127247367597.4994868880193

%H R. H. Hardin, <a href="/A316239/b316239.txt">Table of n, a(n) for n = 1..180</a>

%F Empirical for column k:

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

%F k=2: a(n) = 2*a(n-1) -a(n-2) +8*a(n-3) -8*a(n-4)

%F k=3: [order 18] for n>20

%F k=4: [order 64] for n>67

%e Some solutions for n=5 k=4

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

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

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

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

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

%Y Column 1 is A000045(n+1).

%Y Column 2 is A304349.

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_, Jun 27 2018

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 15 13:24 EDT 2024. Contains 375173 sequences. (Running on oeis4.)