0,2
D. H. Riedelmeier, Counting polyominoes: yet another attack, Discrete Math., 36, 191-203, 1981.
Adjacent sequences: A014556 A014557 A014558 this_sequence A014560 A014561 A014562
Sequence in context: A128123 A058081 A034533 this_sequence A027098 A121483 A077834
dead
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