Number of free pure identity multifunctions (with empty expressions allowed) with one atom and n positions.

A317879

Number of free pure identity multifunctions (with empty expressions allowed) with one atom and n positions.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =29a(6) =83a(7) =251a(8) =767a(9) =2403a(10) =7652a(11) =24758a(12) =80875a(13) =266803a(14) =887330a(15) =2972108a(16) =10016981a(17) =33942461a(18) =115572864a(19) =395226810a(20) =1356840007a(21) =4674552089a(22) =16156355357a(23) =56003840659a(24) =194651585875a(25) =678220460687

External references