159435domain: NAppears in sequencesa(n) = T(2n, n), T given by A026758.at n=9A026759a(n) = T(n, floor(n/2)), T given by A026758.at n=18A026764Sum of squares of numbers in row n of array T given by A026758.at n=9A027237a(n) is number of solutions of the equation sigma(x)=10^n.at n=35A110078