-221389

Appears in sequences

• Triangle, read by rows, each row n being defined by g.f. Product_{k=1..n} (k + x - k*x^2), for n >= 0.at n=56A322225
• a(n) = [x^n] Product_{k=1..n} (k + x - k*x^2), for n >= 0.at n=7A322228