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A145926 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation. 0
1, 1, 5, 1, 30, 11, 1066, 349, 107926, 18649, 30463506, 4281564, 28469202195, 3104114083, 81975632480940, 6299974483160, 716618459027321854, 40647817503851905, 19639345520014570444862, 820703096331703481460 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A144891 A135892 A049460 * A062140 A144355 A049353

Adjacent sequences:  A145923 A145924 A145925 * A145927 A145928 A145929

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2008

STATUS

approved

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Last modified November 15 13:47 EST 2019. Contains 329149 sequences. (Running on oeis4.)