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A147445 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 25, 429, 829, 9009, 20193, 266141, 668397, 14825377, 42405573, 3005094483, 10429358879, 1452403109221, 6133471038695, 1040989050455951, 5208691049601333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.1.0.0.0.0.0.0.0.1

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.0.0.1.1.0.1.1.0.0

.1.0.0.1.0.1.0.0.1

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.0.0.1.1.0.1.1.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A263540 A183346 A166666 * A129910 A259075 A212909

Adjacent sequences:  A147442 A147443 A147444 * A147446 A147447 A147448

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 21 12:12 EDT 2019. Contains 328299 sequences. (Running on oeis4.)