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A145802 Number of islands of ones fitting in an n X n array symmetric under horizontal reflection with all ones connected only either two adjacent vertically or two adjacent horizontally. 0
0, 1, 2, 4, 6, 9, 12, 15, 19, 25, 28, 33, 40, 49, 53, 60, 69, 81, 86, 95 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

EXAMPLE

8 X 8 example with 15 islands

.1.0.0.1.1.0.0.1

.1.0.1.0.0.1.0.1

.0.0.1.0.0.1.0.0

.1.1.0.1.1.0.1.1

.0.0.1.0.0.1.0.0

.1.0.1.0.0.1.0.1

.1.0.0.1.1.0.0.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A194201 A194203 A130025 * A076271 A036441 A180107

Adjacent sequences:  A145799 A145800 A145801 * A145803 A145804 A145805

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Oct 19 2008

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Last modified February 16 17:11 EST 2012. Contains 205938 sequences.