Number of set partitions of [n] with minimal block length multiplicity equal to two.
A271762
Number of set partitions of [n] with minimal block length multiplicity equal to two.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =0a(4) =55a(5) =105a(6) =945a(7) =1218a(8) =15456a(9) =26785a(10) =705573a(11) =2502786a(12) =32988670a(13) =169561483a(14) =1757881723a(15) =10231748010a(16) =84389906941a(17) =540218433147
External references
- oeis: A271762