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%I #21 May 26 2021 22:45:30
%S 0,0,2,2,8,6,16,12,30,18,40,36,64,40,82,58,106,72,130,92,174,104,190,
%T 140,242,150,268,186,316,220,366,242,426,260,458,322,530,326,568,392,
%U 640,434,706,470,798,496,826,566,928,602,996,670,1080,718,1166,792
%N a(n) = n^2 - A344533(n).
%C All terms are even.
%C This is the number of hidden trees (cf. A344533).
%Y Cf. A344533.
%K nonn
%O 1,3
%A _Paul Curtz_, May 24 2021