260340

Appears in sequences

• Number of (n+2)X1 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=16A223645
• Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to a C_4, where C_4 is the cycle graph on four vertices.at n=8A243243