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Duplicate of A000908.
0

%I #12 Feb 16 2023 19:08:58

%S 0,0,1,4,14,47,164,565,1982,6977,24850,89082,321855,1169853,4276923,

%T 15713799,57998270,214934984,799473752,2983682702,11169374372,

%U 41929478873,157807392886,595340271682,2250901007539,8527699269192,32369066434276

%N Duplicate of A000908.

%K dead

%O 0,4