A147461 - OEIS

A147461

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 153, 277, 1847, 3941, 42907, 102189, 2677867, 7544909, 418620919, 1424570893, 112979816299, 454603733387, 48372707337627, 228790897270887, 42082899027578731, 234640059600540451

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OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A019328 A119786 A147429 * A146366 A146603 A159003

Adjacent sequences: A147458 A147459 A147460 * A147462 A147463 A147464

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved