Number of entries in the second blocks of all set partitions of [n] when blocks are ordered by increasing lengths.
A332942
Number of entries in the second blocks of all set partitions of [n] when blocks are ordered by increasing lengths.
Terms
- a(0) =1a(1) =7a(2) =25a(3) =101a(4) =366a(5) =1555a(6) =7099a(7) =34627a(8) =184033a(9) =1059972a(10) =6425992a(11) =41266681a(12) =280938451a(13) =2009636335a(14) =15025372685a(15) =117386912433a(16) =956458929950
External references
- oeis: A332942