108960

Appears in sequences

• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k even fixed points (0 <= k <= floor(n/2)).at n=26A161134
• Averages of twin prime pairs of the form : sum of two or more consecutive squares.at n=29A174716
• a(n) = 121*n^2 + 2*n.at n=29A181679
• Numbers k such that (5*10^k + 91) / 3 is prime.at n=25A275020