128448
domain: N
Appears in sequences
- Expansion of e.g.f. cos(x)/cos(sinh(x)), even powers only.at n=5A009105
- Number of pairs of cycles of cardinality at least 2.at n=9A052518
- Equals two maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX5 array.at n=3A220405
- T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nXk array.at n=31A220406
- Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 4Xn array.at n=4A220409
- Numbers k such that k = Product (p_j^e_j) = Product (pi(p_j)*p_j), where pi() = A000720.at n=36A304194
- Triangle read by rows: T(n,k) is the number of achiral combinatorial maps with n edges and genus k, 0 <= k <= floor(n/2).at n=48A380234