-7266

Appears in sequences

• a(n) = -(1/2)*(n+2)*(n^2 - 6*n - 1).at n=26A028494
• a(n) = a(n-1) - (n-4)*a(n-4), with a(0)=0, a(1)=1, a(2)=2, a(3)=1.at n=18A122049