66376424160
domain: N
Appears in sequences
- a(0), a(1), a(2), ... satisfy Sum_{k=0..n} a(k)*binomial(n,k) = 2^binomial(n,2), for n >= 0.at n=9A006129
- Regular triangle where T(n,k) is the number of labeled k-uniform hypergraphs spanning n vertices.at n=37A299471
- Triangle read by rows where T(n,k) is the number of labeled graphs with n vertices and k non-isolated vertices.at n=54A370319