2803975860domain: NAppears in sequencesa(n) = T(n,n), T given by A026584. Also a(n) is the number of integer strings s(0), ..., s(n) counted by T, such that s(n)=0.at n=26A026585a(n) = self-convolution of row n of array T given by A026584.at n=13A027282