-3068

Appears in sequences

• Even triangle !n. This table read by rows gives the coefficients of sum formulas of n-th Left factorials (A003422). The k-th row (6>=k>=1) contains T(i,k) for i=1 to k+2, where k=[2*n+1+(-1)^(n-1)]/4 and T(i,k) satisfies !n = Sum_{i=1..k+2} T(i,k) * n^(i-1) / (2*k-2)!.at n=8A102411
• Bond series for first perpendicular moment of 4.8 (bathroom tile) lattice.at n=23A120556
• 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=41A135690
• a(n) = 4 - 3*2^n.at n=10A165751
• A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=22A176227
• A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=26A176227