30465

Appears in sequences

• Number of Twopins positions.at n=22A005685
• Number of fibered rational knots with n crossings.at n=24A051449
• Number of (undirected) paths in the n-wheel graph.at n=18A291919
• a(n) = Sum_{k=0..n} sigma(k^2 + 1), where sigma(k) is the sum of divisors of k (A000203).at n=40A333172
• a(n) is the least number k such that the k-th difference between consecutive practical numbers, A179651(k), equals 2*n, or -1 if no such k exists.at n=24A364706