login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147499 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 57, 57, 501, 501, 8327, 8327, 120657, 120657, 1392679, 1392679, 36251459, 36251459, 1768772831, 1768772831 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.1.1.1.0.1.1.1.0

.0.1.1.0.0.0.1.1.0

.1.1.1.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.1.1.1

.0.1.1.0.0.0.1.1.0

.0.1.1.1.0.1.1.1.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A205380 A246035 A147340 * A146591 A146868 A147430

Adjacent sequences:  A147496 A147497 A147498 * A147500 A147501 A147502

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 November 18 12:35 EST 2019. Contains 329261 sequences. (Running on oeis4.)