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!)
A198253 T(n,k)=Number of 2nX2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 8
1, 1, 1, 2, 5, 2, 5, 40, 40, 5, 15, 485, 1675, 485, 15, 51, 6528, 81440, 81440, 6528, 51, 187, 90641, 4059950, 14520192, 4059950, 90641, 187, 715, 1268648, 203087097, 2606019472, 2606019472, 203087097, 1268648, 715, 2795, 17794141, 10164141586 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Table starts

.....1.........1............2..............5...............15...............51

.....1.........5...........40............485.............6528............90641

.....2........40.........1675..........81440..........4059950........203087097

.....5.......485........81440.......14520192.......2606019472.....468268681671

....15......6528......4059950.....2606019472....1683040515731.1088857594220452

....51.....90641....203087097...468268681671.1088857594220452

...187...1268648..10164141586.84165911962889

...715..17794141.508740409496

..2795.249720000

.11051

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

Some solutions for n=5 k=3

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0

..0..1..1..2..2..0....0..1..1..2..2..0....0..1..1..2..2..0....0..1..1..2..2..0

..0..1..1..2..2..0....0..1..1..2..2..0....0..1..1..2..2..0....0..1..1..2..2..0

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..3..3..0....0..3..3..0..0..0

..3..3..4..4..3..3....3..3..3..3..4..4....1..1..0..3..3..0....0..3..3..0..4..4

..3..3..4..4..3..3....3..0..0..3..4..4....1..1..0..0..0..0....0..0..0..0..4..4

..4..4..0..0..4..4....3..0..0..3..0..0....4..4..3..3..2..2....3..3..1..1..2..2

..4..4..0..0..4..4....3..3..3..3..0..0....4..4..3..3..2..2....3..3..1..1..2..2

..0..0..1..1..3..3....2..2..4..4..1..1....0..0..4..4..3..3....1..1..2..2..0..0

..0..0..1..1..3..3....2..2..4..4..1..1....0..0..4..4..3..3....1..1..2..2..0..0

CROSSREFS

Sequence in context: A240642 A240774 A198604 * A159989 A195702 A309714

Adjacent sequences:  A198250 A198251 A198252 * A198254 A198255 A198256

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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 July 14 19:48 EDT 2020. Contains 335729 sequences. (Running on oeis4.)