17946

Appears in sequences

• a(n) = [ a(n-1)/a(1) + a(n-2)/a(2) + ... + a(1)/a(n-1) ], for n >= 3.at n=30A022869
• a(n) = prime(n)*prime(n-1) - 1.at n=32A023515
• Number of partitions of n into parts not of the form 25k, 25k+11 or 25k-11. Also number of partitions with at most 10 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=36A036010
• Numbers k such that 3*7^k + 2 is prime.at n=19A059041
• a(n) = Least i in range [A165598(n),A165598(n+1)] for which abs(A165597(i)) gets the maximum value in that range.at n=23A165599
• Number of (n+2) X 5 binary arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=18A190027
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 246", based on the 5-celled von Neumann neighborhood.at n=33A271010
• a(n) is the number of Dyck paths of (2,3)-knight moves of size n.at n=29A285174
• Non-isomorphic colorings of the cube under rotations, using at most N colors on the faces and M colors on the vertices. Square array H(N,M) with N,M > 0 read by antidiagonals.at n=8A316093
• a(n) is the largest integer m such that m^n <= n^prime(n).at n=17A318199
• Number of inequivalent leaf-colorings of rooted trees with n nodes.at n=9A318226
• Number of fixed polyominoids with n cells, allowing any corner-connections and flat edge-connections.at n=3A366008
• Number of subsets of {2..n} such that the product of the elements plus 1 is a prime.at n=17A369392
• E.g.f. satisfies A(x) = 1 + x*A(x)^3*(exp(x*A(x)) - 1).at n=6A371120