Number of set partitions of [2n] into exactly n blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.
A274875
Number of set partitions of [2n] into exactly n blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =3a(4) =35a(5) =226a(6) =3632a(7) =36780a(8) =770481a(9) =10677444a(10) =277114769a(11) =4882093495a(12) =151410615066
External references
- oeis: A274875