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A146869 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 29, 49, 117, 309, 1103, 4069, 20291, 72247, 389841, 1904157, 13920727, 88083783, 777496329, 5560593885, 59069816813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.1.1.0.1.0.0

.1.1.1.1.0.1.1.0

.0.0.0.0.0.1.1.0

.0.1.1.0.0.0.0.0

.0.1.1.0.1.1.1.1

.0.0.1.0.1.1.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A322946 A098949 A031296 * A129397 A136392 A272732

Adjacent sequences:  A146866 A146867 A146868 * A146870 A146871 A146872

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 31 19:37 EDT 2020. Contains 333151 sequences. (Running on oeis4.)