232920

Appears in sequences

• Numbers k such that 7*10^k + 1 is prime.at n=22A056804
• Generalized Stirling2 array (4,3).at n=17A090440
• a(n) = 1 + A_n(n), or a(n) = -1 if sequence A_n is not defined up to index n.at n=20A107357
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 1,5,5,0,0,4,3 for x=0,1,2,3,4,5,6.at n=6A197570
• Number of graceful labelings of the n-cycle graph.at n=12A333720