Number of different partitions of the set {1, 2, ..., n} into an even number of blocks such that each block contains at least 2 elements.

A097763

Number of different partitions of the set {1, 2, ..., n} into an even number of blocks such that each block contains at least 2 elements.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =10a(5) =25a(6) =56a(7) =224a(8) =1506a(9) =9951a(10) =57992a(11) =315425a(12) =1761552a(13) =11022180a(14) =78474748a(15) =603715831a(16) =4771273414a(17) =38070877273a(18) =309146434240

External references