53747

Appears in sequences

• a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^3.at n=35A008457
• Sum_{n>=0} a(n) * x^n / (n!)^2 = exp( BesselI(0,2*sqrt(x)) - 1 - x^2 / 4 ).at n=7A346271