Number of ordered partitions of an n-set without blocks of size 4.

A343787

Number of ordered partitions of an n-set without blocks of size 4.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =74a(5) =531a(6) =4563a(7) =45753a(8) =524345a(9) =6760039a(10) =96837333a(11) =1525909903a(12) =26230304235a(13) =488472319271

External references