59830

Appears in sequences

• Expansion of x/((1 - x - x^4)*(1 - x)^2).at n=29A145131
• Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=11A281468
• G.f.: Sum_{n>=0} (n+1)*(n+2)/2 * x^n * (1 + x^n)^n.at n=63A326003
• Heptagonal numbers which are products of four distinct primes.at n=8A351867
• Triangle read by rows: T(n,k) is the number of simple digraphs on labeled n nodes with k strongly connected components.at n=19A361455
• Triangular array read by rows. T(n,k) is the number of labeled digraphs on [n] having exactly k strongly connected components all of which are simple cycles, n >= 0, 0 <= k <= n.at n=19A361527
• Triangular array read by rows. T(n,k) is the number of labeled digraphs on [n] with exactly k strongly connected components of size 1, n>=0, 0<=k<=n.at n=18A361592