login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A196989 T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,4,1,0 for x=0,1,2,3,4 7

%I

%S 1,1,1,1,1,1,1,3,3,1,1,5,10,5,1,1,9,25,25,9,1,1,17,81,113,81,17,1,1,

%T 31,242,547,547,242,31,1,1,57,707,2499,4244,2499,707,57,1,1,105,2095,

%U 11647,31791,31791,11647,2095,105,1,1,193,6224,54845,242602,389518,242602

%N T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,4,1,0 for x=0,1,2,3,4

%C Every 0 is next to 0 2's, every 1 is next to 1 3's, every 2 is next to 2 4's, every 3 is next to 3 1's, every 4 is next to 4 0's

%C Table starts

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

%C .1...1.....3.......5.........9.........17...........31.............57

%C .1...3....10......25........81........242..........707...........2095

%C .1...5....25.....113.......547.......2499........11647..........54845

%C .1...9....81.....547......4244......31791.......242602........1838579

%C .1..17...242....2499.....31791.....389518......4743311.......58038517

%C .1..31...707...11647....242602....4743311.....93411402.....1863379223

%C .1..57..2095...54845...1838579...58038517...1863379223....60168452277

%C .1.105..6224..256395..13941719..713190410..37097158961..1938441718877

%C .1.193.18499.1198317.105949190.8761030047.737372275936.62562309931101

%H R. H. Hardin, <a href="/A196989/b196989.txt">Table of n, a(n) for n = 1..264</a>

%e Some solutions for n=6 k=4

%e ..0..1..3..1....1..3..1..0....0..0..0..1....0..0..1..0....0..1..0..0

%e ..0..0..1..0....1..1..0..0....0..0..1..3....0..1..3..0....0..3..1..1

%e ..0..0..0..0....3..1..0..1....0..0..0..1....0..0..1..0....0..1..1..3

%e ..0..1..3..1....1..0..1..3....0..0..4..0....1..0..0..0....0..1..0..1

%e ..0..0..1..0....1..3..1..1....0..4..0..0....3..1..0..0....0..3..1..0

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

%Y Column 2 is A000213

%K nonn,tabl

%O 1,8

%A _R. H. Hardin_ Oct 08 2011

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 15:03 EDT 2020. Contains 333107 sequences. (Running on oeis4.)