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%I #11 Jan 27 2024 13:47:39
%S 0,0,1,2,5,14,35,90,245,644,1716,4707,12727,34683,96174,264784,732785,
%T 2051338,5719684,16007081,45160093,127106181,358743903,1018566177,
%U 2887666445,8204375034
%N a(n) = number of Yamanouchi words over the alphabet {1, 2, 3} of length n that start with 3.
%Y Column 3 in A369589.
%Y Number of Yamanouchi words over the alphabet {1, 2, 3} is given by A001006, and by A217323 for the words containing 3.
%Y Cf. A238728, A369590.
%K nonn,more
%O 1,4
%A _Max Alekseyev_, Jan 26 2024