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

A317881

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =7a(6) =15a(7) =37a(8) =91a(9) =231a(10) =593a(11) =1557a(12) =4111a(13) =10941a(14) =29295a(15) =79087a(16) =215015a(17) =587463a(18) =1611985a(19) =4441473a(20) =12284513a(21) =34095797a(22) =94931525a(23) =265061363a(24) =742029431a(25) =2082310665a(26) =5856540305a(27) =16505796865a(28) =46608877763a(29) =131850193107

External references