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!)
A147322 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 5, 9, 15, 23, 50, 117, 289, 741, 2046, 5466, 16079, 52199, 188773, 719705, 3000618 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

.1.0.0.0.1.0.0.0.1

.1.0.0.0.1.0.0.0.1

.1.1.1.1.0.1.1.1.1

.1.0.0.0.1.0.0.0.1

.1.0.0.0.1.0.0.0.1

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A205536 A281704 A074693 * A143282 A323475 A097083

Adjacent sequences:  A147319 A147320 A147321 * A147323 A147324 A147325

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 August 8 02:22 EDT 2020. Contains 336290 sequences. (Running on oeis4.)