9971750domain: NAppears in sequencesPalindromic numbers in bases 4 and 9 written in base 10.at n=22A259387Irregular triangle read by rows: T(n,k) (0 <= k <= n^2) are coefficients of cluster density function for site percolation on an n X n 2D nnsquare lattice with open boundary conditions.at n=46A365947