351020

Appears in sequences

• E.g.f.: exp(1)*P(x) - Q(x), where P(x) = 1/Product_{n>=1} (1 - x^n/n) and Q(x) = Sum_{n>=1} 1/Product_{k=1..n} (k - x^k).at n=8A249078
• Number of triangles on a 4 X n grid.at n=32A296367