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A147333 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 11, 15, 249, 439, 3525, 7243, 86415, 202083, 5858179, 16166669, 860820947, 2825911051, 229675621375, 888780016627, 105005577010021, 476804047189207, 92035361068862489 (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

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.0.1.1.0.0.0.1.1.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A115779 A147339 A147377 * A097156 A138791 A132990

Adjacent sequences:  A147330 A147331 A147332 * A147334 A147335 A147336

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 24 09:10 EDT 2021. Contains 347630 sequences. (Running on oeis4.)