Number of set partitions of [n] into exactly six blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.

A274870

Number of set partitions of [n] into exactly six blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.

Terms

    a(0) =1a(1) =3a(2) =22a(3) =66a(4) =311a(5) =933a(6) =3632a(7) =10896a(8) =38337a(9) =115011a(10) =381594a(11) =1144782a(12) =3664507a(13) =10993521a(14) =34404964a(15) =103214892a(16) =318365333a(17) =955095999a(18) =2918309966a(19) =8754929898a(20) =26585715663a(21) =79757146989a(22) =241208177496a(23) =723624532488

External references