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

A275423

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =7a(7) =22a(8) =57a(9) =127a(10) =379a(11) =1849a(12) =9109a(13) =37324a(14) =128129a(15) =507508a(16) =3031393a(17) =19609773a(18) =108440893a(19) =500515633a(20) =2467616641a(21) =17154715726a(22) =134519207131a(23) =927764339426

External references