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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A183724 1/12 the number of (n+1) X 5 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction. 1

%I

%S 87,388,1790,14886,272215,7319684,200260149,5355252106,139489865583,

%T 3561214845505,89499710973670,2221523267475056,54589402697720455,

%U 1330321340313497085,32193928583886647023,774480659129262018036

%N 1/12 the number of (n+1) X 5 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

%C Column 4 of A183729.

%H R. H. Hardin, <a href="/A183724/b183724.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions with the first block increasing clockwise for 3 X 5:

%e ..0..1..2..1..2....2..4..3..2..4....0..1..2..1..2....5..0..4..5..0

%e ..5..4..3..5..4....1..5..0..1..0....5..4..3..5..3....2..1..3..2..1

%e ..0..1..2..1..2....2..4..3..2..3....0..1..2..0..2....3..0..4..5..0

%e ...

%e ...R..R..L..R.......R..L..L..R.......R..R..L..R.......R..L..R..R...

%e ...L..L..R..L.......L..R..R..L.......L..L..R..L.......L..R..L..L...

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 06 2011

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.

Last modified February 1 04:32 EST 2023. Contains 359981 sequences. (Running on oeis4.)