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A145859 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in two by two blocks. 0
1, 2, 1, 2, 2, 7, 5, 38, 12, 182, 72, 1536, 513, 21327, 4531, 360939, 68662, 9098657, 1429824, 345351393, 40840428, 18058986880, 1747979822, 1362075540043, 106711196102, 149443289019658, 9237029528023, 23324890541218597 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 7 X 7 example

.0.0.0.0.0.0.0

.1.1.0.0.0.1.1

.1.1.0.0.0.1.1

.0.0.0.0.0.0.0

.1.1.0.0.0.1.1

.1.1.0.0.0.1.1

.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A077014 A093655 A023140 * A145863 A240492 A110775

Adjacent sequences:  A145856 A145857 A145858 * A145860 A145861 A145862

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 22 2008

STATUS

approved

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Last modified May 23 16:39 EDT 2022. Contains 353977 sequences. (Running on oeis4.)