-5064

Appears in sequences

• Coordination sequence for octagonal tiling is a(n)*sqrt(2) + A103909(n).at n=35A103908
• Triangle read by rows: T(n,k) = (-1)^n * n! + (-1)^(k+1) * k! for n >= 2 and 1 <= k <= n-1.at n=18A373967