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Number of free rooted (or pointed) polyiamonds with n cells.
2

%I #8 Sep 20 2024 10:12:49

%S 1,1,2,6,16,50,150,458,1388,4233,12875,39227,119456,363868,1107912,

%T 3372793,10264156,31228969

%N Number of free rooted (or pointed) polyiamonds with n cells.

%H <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>.

%Y Cf. A000577, A126202, A369362, A369366.

%K nonn,more

%O 1,3

%A _Pontus von Brömssen_, Jan 22 2024

%E a(18) from _John Mason_, Sep 20 2024