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%I #7 Jan 16 2023 09:03:17
%S 0,0,1,1,2,3,6,8,20,34,84,182
%N Number of polyhexes with perimeter at most 2n.
%C The perimeter of a polyhex is always even.
%C Partial sums of A057779.
%C a(2n+1) >= A131467(n).
%Y Cf. A038142 (planar cata-polyhexes with n cells).
%Y Cf. A057779 (hexagonal polyominoes with perimeter 2n).
%Y Cf. A131467 (planar polyhexes with at most n cells).
%K hard,more,nonn
%O 1,5
%A _Tanya Khovanova_, Aug 11 2007
%E Offset corrected by _John Mason_, Jan 16 2023
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