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Increase in the number of free polyominoes from order n to n+1.
1

%I #12 Apr 15 2023 14:34:50

%S 0,0,1,3,7,23,73,261,916,3370,12418,46527,174991,663380,2524605,

%T 9652679,37028654,142514143,550002180,2128047718,8252388728,

%U 32068797010,124855150040,486952692675,1902227344361,7441861777311,29153922116412,114358089656116

%N Increase in the number of free polyominoes from order n to n+1.

%H John Mason, <a href="/A283109/b283109.txt">Table of n, a(n) for n = 0..49</a>

%F a(n) = A000105(n+1) - A000105(n).

%Y Cf. A000105.

%K nonn

%O 0,4

%A _Francois Alcover_, Feb 28 2017