Number of set partitions of [n] with distinct block sizes and one of the block sizes is 2.
A327881
Number of set partitions of [n] with distinct block sizes and one of the block sizes is 2.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =0a(5) =10a(6) =75a(7) =126a(8) =196a(9) =1548a(10) =15525a(11) =39820a(12) =161106a(13) =358722a(14) =3705884a(15) =46623045a(16) =142988280a(17) =768721504a(18) =3560215293a(19) =12250746432a(20) =144581799790
External references
- oeis: A327881