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.

1, 1, 1, 1, 1, 3, 9, 19, 45, 171, 795, 4151, 23359, 160489, 1338097, 13206661, 152301919, 2072243263, 33494417573, 640878789973, 14468834259627, 385605211468773, 12154715457880649, 453340950276092835

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