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!)
A147326 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 5, 1, 9, 1, 54, 15, 1010, 305, 26482, 3993, 1090248, 85931, 79078189, 4847983, 11622838412, 605747926, 3166762458310, 124132744693, 1523768055043582, 41573048881668 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A046580 A050358 A147319 * A336048 A143114 A103133

Adjacent sequences:  A147323 A147324 A147325 * A147327 A147328 A147329

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 October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)