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%I #7 Jan 05 2023 11:05:00
%S 1,2,12,51,217,846,3211
%N Number of free polyiamonds of n cells with multiply-connected interiors.
%F a(n) = A070764(n) - A359524(n).
%Y Cf. A000577, A070764, A359519, A359524.
%K nonn,more
%O 12,2
%A _John Mason_, Jan 05 2023
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