10677444

Appears in sequences

• Number of set partitions of [n] into exactly nine blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.at n=9A274873
• 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.at n=9A274875