131124

Appears in sequences

• Total number of vertices in all finite n-dimensional convex regular polytopes, or 0 if the number is infinite.at n=17A140800
• Triangle read by rows, T(n, k) = binomial(n, k) * Sum_{j=0..n-k} E(n-k, j)*2^j, where E(n, k) are the Eulerian numbers A173018(n, k), for 0 <= k <= n.at n=38A154921
• Third column of A154921.at n=6A154931
• a(n) = 2^n + 3n + 1.at n=17A194455
• Triangle relating to ordered Bell numbers, A000670.at n=34A208744
• Triangle read by rows: T(n,k) is the number of labeled loop-threshold graphs on vertex set [n] with k components, for n >= 1 and 1 <= k <= n.at n=30A350531