135993

Appears in sequences

• Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that the set {|p(i)-i|, i=1,2,...,n} has exactly k elements (1<=k<=n).at n=40A125183
• Numbers k such that 381*2^k+1 is prime.at n=38A323033
• Indices of high points in A245340.at n=23A370959