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!)
A146030 Number of n X n binary arrays with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0
1, 1, 5, 19, 79, 523, 9169, 183491, 4964583, 219022025, 16321424419, 1718337883769, 267799571260427, 65285269375319479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.1

.0.0.1.1.1.0.0.0

.0.0.1.0.0.1.1.1

.1.0.1.0.1.0.0.1

.1.0.0.0.1.0.0.1

.1.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A149779 A125657 A111929 * A098041 A346817 A317131

Adjacent sequences:  A146027 A146028 A146029 * A146031 A146032 A146033

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

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 October 17 07:39 EDT 2021. Contains 348048 sequences. (Running on oeis4.)