A147406 - OEIS

A147406

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1001-1111 pattern in any orientation.

1, 1, 1, 5, 1, 9, 9, 43, 127, 501, 1169, 21077, 14501, 1245641, 426195, 52418221, 46737495, 4157184667, 7896602235, 878958425775, 1373529372451, 470697855207829, 348267628548895, 343015836691596183

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.1.0.0.1.0.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A082020 A256559 A182498 * A147354 A134233 A100542

Adjacent sequences: A147403 A147404 A147405 * A147407 A147408 A147409

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved