0,8
A048634 := proc(n) option remember; if n<=1 then 0 elif n=2 then 1 else A048634(n-1)*A048634(n-3)+A048634(n-2); fi; end;
Sequence in context: A000756 A093999 A042445 this_sequence A012899 A110364 A111288
Adjacent sequences: A048631 A048632 A048633 this_sequence A048635 A048636 A048637
nonn,easy
njas, David(AT)interface.co.uk
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