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A057424
Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole.
+0
1
1, 1, 5, 7, 21, 30, 88, 116, 336
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Maintained by
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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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