939600

Appears in sequences

• G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1+2*x)^n*(1+3*x)^n.at n=11A251688
• Average of amicable pairs (x,y), ordered by the smaller value x given in A002025.at n=39A275315
• Average of amicable pairs (x,y), ordered by the sum x+y given in A259953.at n=39A275316