-2906

Appears in sequences

• Irregular triangle read by rows: let c = -(x - x^2), b = (-1 - a + 2 x)/x, and a = 0, expansion of p(x, n) = (a + b*x)*p(x, n - 1) + c*p(x, n - 2).at n=61A139144
• Expansion of 1/(1 + x * Sum_{k>=1} prime(k)*x^k).at n=23A307899