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%I #7 Oct 18 2020 06:05:23
%S 1,0,0,0,0,1,0,0,1,0,1,1,3,2,4,6,13,15,30,50,93,158,287,513,950,1735,
%T 3212,5945,11099,20720,38910,73002,137821,259757
%N a(n) is the number of free polyominoes with sprawl n.
%C The sprawl of a polyomino is the number of cells in a polyomino plus the number of cells adjacent to it.
%H Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a338/A338213.java">Java program</a> (github)
%F Antidiagonal sums of A338211.
%Y Cf. A000105, A338211, A338212.
%K nonn,more
%O 0,13
%A _Sean A. Irvine_ and _Allan C. Wechsler_, Oct 17 2020
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