Number of partitions of [n] whose blocks can be ordered such that the i-th block has at least i elements and no block j > i has an element smaller than the i-th smallest element of block i.
A362893
Number of partitions of [n] whose blocks can be ordered such that the i-th block 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) =1a(3) =2a(4) =5a(5) =12a(6) =28a(7) =69a(8) =193a(9) =614a(10) =2103a(11) =7359a(12) =25660a(13) =88914a(14) =309502a(15) =1102146a(16) =4092840a(17) =16046224a(18) =66410789a(19) =286905421a(20) =1273646720a(21) =5729762139a(22) =25881820352a(23) =116872997038a(24) =527375160184
External references
- oeis: A362893