Number of series-reduced achiral free pure multifunctions (with empty expressions allowed) with one atom and n positions.

A317884

Number of series-reduced achiral free pure multifunctions (with empty expressions allowed) with one atom and n positions.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =14a(7) =26a(8) =47a(9) =87a(10) =160a(11) =295a(12) =540a(13) =997a(14) =1832a(15) =3369a(16) =6197a(17) =11406a(18) =20975a(19) =38594a(20) =70991a(21) =130610a(22) =240275a(23) =442043a(24) =813184a(25) =1496053a(26) =2752251a(27) =5063319a(28) =9314879a(29) =17136632

External references