Number of set partitions of [n] with symmetric block size list of length A004525(n).

A305197

Number of set partitions of [n] with symmetric block size list of length A004525(n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =7a(6) =19a(7) =56a(8) =171a(9) =470a(10) =2066a(11) =10299a(12) =31346a(13) =91925a(14) =559987a(15) =3939653a(16) =11954993a(17) =36298007a(18) =282835456a(19) =2571177913a(20) =7785919355a(21) =24158837489a(22) =229359684137

External references