Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its six immediate predecessors.

A272434

Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its six immediate predecessors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =7a(4) =9a(5) =31a(6) =403a(7) =757a(8) =2873a(9) =12607a(10) =333051a(11) =761377a(12) =3699435a(13) =16383121a(14) =108710085a(15) =4855474267a(16) =13594184793a(17) =76375572751a(18) =388660153867

External references