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!)
A211692 Number of -4..4 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, three or four distinct values for every i<=n and j<=n 1

%I

%S 69,533,4033,30177,223197,1634877,11870705,85525665,611921697,

%T 4350979769,30763863645,216419598445,1515531563165,10568991793581,

%U 73429250621533,508417994900109,3509319518941045,24154369305654701,165824297901834385

%N Number of -4..4 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, three or four distinct values for every i<=n and j<=n

%H R. H. Hardin, <a href="/A211692/b211692.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e .-2...-3...-3...-4...-2...-2...-4....0...-2...-2...-4...-3...-4...-4...-1...-4

%e ..4....2...-1....0....1...-3....4...-4....4....1....4....3...-3....3...-3....3

%e .-1....3...-4...-1...-2...-1....2....0....0....2....2...-2....2....4....4...-3

%e ..0...-2....3...-2...-4....2...-3...-4...-4....3...-2...-1....0...-3...-2...-4

%e ..0...-3....2....4....0...-3....3...-2...-3....4....1...-4...-4....4....0...-3

%e ..3....2...-4...-4...-4....0...-3....3....2...-4....0...-3....4...-3....3....4

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 18 2012

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 18 21:45 EDT 2022. Contains 356215 sequences. (Running on oeis4.)