12815247
domain: N
Appears in sequences
- Number of subsequences of [ 1,...,n ] in which each odd number has an even neighbor.at n=26A007455
- Number of subsequences of [ 1,...,n ] in which each even number has an odd neighbor.at n=26A007481
- a(n) is the number of subsequences of [ 1, ..., 2n ] in which each odd number has an even neighbor.at n=13A007482