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A146153 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either as two by three or three by two blocks. 0
1, 1, 3, 3, 9, 11, 82, 254, 1669, 6665, 68316, 226521, 4561686, 23734103, 704383992, 5907579541, 236178663400, 2337315883467, 150056765859689, 1811327966926780, 189399759509400492, 3276661629995792339, 507766610202105772758 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A005296 A124281 A320293 * A339028 A173048 A165992

Adjacent sequences:  A146150 A146151 A146152 * A146154 A146155 A146156

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified June 18 19:04 EDT 2021. Contains 345120 sequences. (Running on oeis4.)