702525
domain: N
Appears in sequences
- Number of side-2 hexagonal 0..n arrays with values nondecreasing E, SW and SE.at n=15A216938
- Number of closure operators on a set of n elements which satisfy the T_1 separation axiom.at n=5A334254
- Number of strict closure operators on a set of n elements which satisfy the T_1 separation axiom.at n=5A334255