Number of partitions of [n] whose blocks can be ordered such that the i-th block (except possibly the last) has at least i elements and no block j > i has an element smaller than the i-th smallest element of block i.
A362549
Number of partitions of [n] whose blocks can be ordered such that the i-th block (except possibly the last) has at least i elements and no block j > i has an element smaller than the i-th smallest element of block i.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =23a(6) =64a(7) =187a(8) =566a(9) =1777a(10) =5820a(11) =19944a(12) =71343a(13) =264719a(14) =1011292a(15) =3953381a(16) =15756609a(17) =63945484a(18) =264384828a(19) =1115246518a(20) =4806957739a(21) =21189601861a(22) =95516470253a(23) =439777682222
External references
- oeis: A362549