-29088

Appears in sequences

• Triangular sequence produced from symmetrical power of two matrices of the general type: M={{1, 2, 4, 8}, {2, 1, 2, 4}, {4, 2, 1, 2}, {8, 4, 2, 1}}.at n=42A129964
• a(n) = (-1)^n*(n + 1)*(5*n^2 + 10*n + 1).at n=17A271532