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A147335 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 43, 105, 255, 713, 2327, 7879, 28233, 105483, 441751, 1976665, 9809483, 52365589, 307831711 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

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

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.0.1.0.0.0

.0.0.0.0.0.1.1.1.0.0

.0.0.0.1.1.1.0.0.1.0

.0.0.1.0.1.0.0.0.1.1

.0.0.1.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.1.0.0

.1.1.0.0.0.1.0.1.0.0

.0.1.0.0.1.1.1.0.0.0

.0.0.1.1.1.0.0.0.0.0

.0.0.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146369 A146377 A147501 * A147464 A146058 A155354

Adjacent sequences:  A147332 A147333 A147334 * A147336 A147337 A147338

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 20 10:21 EDT 2021. Contains 348100 sequences. (Running on oeis4.)