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A350030
a(n) is the number of n-celled unholey treelike polyominoes.
1
1, 1, 2, 4, 11, 27, 82, 250, 815, 2685, 9072, 30889, 106290, 367733, 1279573, 4470304, 15676760, 55147665
OFFSET
1,3
FORMULA
a(n) = A308300(n,0).
CROSSREFS
Cf. A308300 (number of simply connected square animals with n cells and k internal vertices, triangle read by rows).
Cf. A131482 (polyominoes with perimeter 2n+2, i.e., treelike).
Sequence in context: A316696 A319616 A148130 * A131482 A234845 A148131
KEYWORD
nonn,hard,more
AUTHOR
John Mason, Dec 09 2021
STATUS
approved