60487

Appears in sequences

• a(n) = [x^(n*(n+1)*(2*n+1)/6)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).at n=9A321208
• Starts of runs of 4 consecutive Gray-code Niven numbers (A344341).at n=41A344344
• E.g.f. satisfies A(x) = exp( x*A(x) * (1 + x^2*A(x)^2) ).at n=6A376564