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%I #16 Feb 26 2023 08:42:46
%S 0,1,4,13,44,153,544,1965,7185,26536,98822,370593,1398029,5300984,
%T 20189792,77198271,296202907,1140024698,4399918134,17024040984,
%U 66018733123,256549059895,998839762846,3895616434744,15217813245743,59534874351097,233231355731136,914864639728729
%N Increase in the number of fixed polyominoes from order n to order n+1.
%H John Mason, <a href="/A283110/b283110.txt">Table of n, a(n) for n = 0..55</a>
%F a(n) = A001168(n+1) - A001168(n); this holds for n=0 if A001168(0) is set conventionally to 1, like it is done for free polyominoes in A000105. We say there are exactly 1 fixed polyominoes of order 0.
%Y Cf. A001168.
%K nonn
%O 0,3
%A _Francois Alcover_, Feb 28 2017
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