-12284

Appears in sequences

• Exponential Riordan array (sech(x), tanh(x)).at n=38A060081
• a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = 1, a(2) = 0.at n=38A105578
• a(n) = a(n-2) - (a(n-1) - a(n-2)) if (n mod 2) = 0, otherwise a(n) = a(n-1) - (a(n-3) - a(n-4)), with a(0) = 0, a(1) = 1, a(2) = -1, a(3) = 2.at n=49A135690
• a(n) = 4 - 3*2^n.at n=12A165751
• A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=29A176227
• A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=34A176227