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%I #10 Mar 06 2017 17:34:43
%S 1,1,1,2,2,4,5,7,9,11,12,16,18,22,26,30,33,37,41,47,52,58,62,69,74,80,
%T 86,92,97,106,112,120,127,135,143,152,159,168,176,186,193,205,213,225,
%U 235,246,256,269,281,291,302
%N Number of distinct envelope areas of the polyominoes of order n.
%C The envelope of a polyomino is the minimal rectangle containing it.
%e a(3) = 2;
%e The two possible envelopes are
%e |*|
%e |*|
%e |*| area = 3;
%e and
%e |*| |
%e |*|*| area = 4.
%Y Cf. A071764 (distinct envelope ratios).
%K nonn
%O 0,4
%A _Francois Alcover_, Feb 28 2017
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