Duplicate of A003436.A000858Duplicate of A003436.Terms a(0) =0a(1) =1a(2) =4a(3) =31a(4) =293a(5) =3326a(6) =44189a(7) =673471a(8) =11588884a(9) =222304897a(10) =4704612119External referencesoeis: A000858