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!)
A165389 Number of slanted 6Xn (i=1..6)X(j=i..n+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner 0
9, 232, 11449, 272548, 5386897, 92769304, 1484483677, 22335647312, 319719142737 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..10.

EXAMPLE

Some solutions for n=3

...1.2.2.............1.1.2.............1.1.2.............1.1.2..........

.....2.2.2.............1.1.1.............2.2.2.............2.2.2........

.......2.2.2.............1.1.1.............2.2.2.............2.2.3......

.........2.2.2.............1.4.4.............2.2.2.............2.3.3....

...........2.3.3.............4.4.4.............3.3.3.............3.3.3..

.............3.4.4.............3.4.4.............3.3.4.............3.4.4

------

...1.1.2.............1.1.2.............1.1.2.............1.1.2..........

.....2.2.2.............2.2.2.............1.1.1.............2.2.2........

.......2.2.2.............2.2.2.............1.1.1.............2.2.2......

.........2.2.4.............2.2.3.............1.1.1.............2.4.4....

...........2.4.4.............2.3.3.............1.1.3.............4.4.4..

.............3.4.4.............3.4.4.............3.3.4.............3.4.4

CROSSREFS

Sequence in context: A181205 A152101 A230178 * A153223 A276536 A288683

Adjacent sequences:  A165386 A165387 A165388 * A165390 A165391 A165392

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

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 January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)