Number of ordered set partitions of [n] with nondecreasing block sizes and maximal block size equal to three.
A272493
Number of ordered set partitions of [n] with nondecreasing block sizes and maximal block size equal to three.
Terms
- a(0) =1a(1) =4a(2) =30a(3) =200a(4) =1610a(5) =13440a(6) =130200a(7) =1327200a(8) =15107400a(9) =183321600a(10) =2422820400a(11) =34104470400a(12) =515897382000
External references
- oeis: A272493