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!)
A146464 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 55, 263, 1645, 13423, 126629, 1447199, 21743065, 415978809, 9965909653, 303132585251, 11591760284391, 555704916934105, 33613901189599473, 2574475177790739409 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.0.1.0.0.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146400 A146408 A050894 * A001354 A200930 A088656

Adjacent sequences:  A146461 A146462 A146463 * A146465 A146466 A146467

KEYWORD

nonn

AUTHOR

R. H. Hardin

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 September 18 04:22 EDT 2021. Contains 347508 sequences. (Running on oeis4.)