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A147463 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 19, 45, 171, 795, 4151, 23359, 160489, 1338097, 13206661, 152301919, 2072243263, 33494417573, 640878789973, 14468834259627, 385605211468773, 12154715457880649, 453340950276092835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.0.0.0.0.0.1.1.0

.0.0.0.0.0.1.1.0

.0.0.0.1.1.0.0.0

.0.1.1.1.1.0.0.0

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A329145 A348377 A147334 * A095828 A028377 A147439

Adjacent sequences:  A147460 A147461 A147462 * A147464 A147465 A147466

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 25 19:19 EDT 2022. Contains 354071 sequences. (Running on oeis4.)