Number of entries in the second blocks of all set partitions of [n] when blocks are ordered by decreasing lengths.
A333059
Number of entries in the second blocks of all set partitions of [n] when blocks are ordered by decreasing lengths.
Terms
- a(0) =1a(1) =4a(2) =17a(3) =76a(4) =357a(5) =1737a(6) =8997a(7) =49420a(8) =289253a(9) =1793221a(10) =11727861a(11) =80576965a(12) =579781009a(13) =4356513727a(14) =34118896917a(15) =277963716808
External references
- oeis: A333059