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!)
A296990 T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 3, 4 or 5 king-move neighboring 1s. 8

%I #4 Dec 22 2017 18:26:46

%S 1,1,1,1,2,1,1,4,4,1,1,7,14,7,1,1,14,28,28,14,1,1,33,98,74,98,33,1,1,

%T 77,447,440,440,447,77,1,1,185,1653,2514,5487,2514,1653,185,1,1,460,

%U 6507,12601,65694,65694,12601,6507,460,1,1,1148,27374,71009,639327,1621832

%N T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 3, 4 or 5 king-move neighboring 1s.

%C Table starts

%C .1...1.....1......1........1...........1............1...............1

%C .1...2.....4......7.......14..........33...........77.............185

%C .1...4....14.....28.......98.........447.........1653............6507

%C .1...7....28.....74......440........2514........12601...........71009

%C .1..14....98....440.....5487.......65694.......639327.........7181983

%C .1..33...447...2514....65694.....1621832.....26724927.......546305423

%C .1..77..1653..12601...639327....26724927....702794334.....24416753991

%C .1.185..6507..71009..7181983...546305423..24416753991...1529176981800

%C .1.460.27374.401521.81977832.11821168013.892243428330.100472530942946

%H R. H. Hardin, <a href="/A296990/b296990.txt">Table of n, a(n) for n = 1..180</a>

%F Empirical for column k:

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

%F k=2: a(n) = 2*a(n-1) +a(n-2) +3*a(n-3) -4*a(n-4) -2*a(n-5) -4*a(n-6)

%F k=3: [order 20]

%F k=4: [order 43]

%e Some solutions for n=5 k=4

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

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

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

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

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

%K nonn,tabl

%O 1,5

%A _R. H. Hardin_, Dec 22 2017

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 April 24 15:18 EDT 2024. Contains 371960 sequences. (Running on oeis4.)