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!)
A186489 Number of (n+1)X(n+1) 0..7 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors 1
4096, 4834, 269126, 1024481, 21122896, 70300633, 1381305433, 5019710665, 92758821369, 358905890921, 6225263778969, 25517863738777, 418350075763113, 1809120677086713, 28157232600156937, 127921801557860825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186490

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for 3X3

..6..0..6....7..4..0....3..6..3....3..5..0....6..7..0....5..4..0....5..0..0

..0..6..0....1..0..4....6..3..6....1..0..5....5..0..7....0..0..4....0..0..0

..3..0..6....0..1..5....3..6..3....0..1..4....0..5..7....0..0..3....0..0..0

CROSSREFS

Sequence in context: A223601 A186490 A223694 * A221261 A069273 A043424

Adjacent sequences:  A186486 A186487 A186488 * A186490 A186491 A186492

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 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 August 8 14:04 EDT 2020. Contains 336298 sequences. (Running on oeis4.)