A146374 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 5, 1, 29, 11, 899, 319, 40083, 6733, 3227138, 377583, 692995026, 72214151, 372813760407, 27637627655, 428803889872888, 21622063008199, 1097097155523363601, 40200348993008961, 6558007935506472623330

Offset

1,5

Links

Table of n, a(n) for n=1..23.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A140713 A125906 A146414 * A188647 A232015 A214882

Adjacent sequences: A146371 A146372 A146373 * A146375 A146376 A146377

Keyword

nonn

Author

R. H. Hardin

Status

approved