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Duplicate of A000633.
1

%I #13 May 29 2023 02:26:37

%S 0,0,0,0,0,1,1,3,7,18,42,109,269,691,1759,4542,11733,30559,79743,

%T 209136,549959,1451178,3838925,10182703,27069940,72121696,192527888,

%U 514908269,1379454526,3701556642,9947456861,26770280299,72138803942

%N Duplicate of A000633.

%Y Cf. A000599, A000600.

%K nonn,dead

%O 0,8

%A _N. J. A. Sloane_