-3161

Appears in sequences

• a(n) = 7 + 12*n - 6*n^2.at n=24A157517
• G.f. A(x) satisfies: A(x) = x + x^2 / exp(A(x) - A(x^2)/2 + A(x^3)/3 - A(x^4)/4 + ...).at n=26A345233