Number of set partitions of [n] such that nine is a multiple of each block size.

A275427

Number of set partitions of [n] such that nine is a multiple of each block size.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =11a(6) =31a(7) =106a(8) =337a(9) =1206a(10) =5031a(11) =20241a(12) =86901a(13) =421422a(14) =2014377a(15) =10015461a(16) =54946881a(17) =301009311a(18) =1692429867a(19) =10319449158a(20) =63321896601a(21) =395830490301

External references