1798940domain: NAppears in sequencesNumber of orbits of the wreath product of S_n with S_n on n X n matrices over {0,1,2,3,4,5,6,7,8,9}.at n=3A099128a(n) = A000292(A000292(n)).at n=10A140236Sum of squared terms in rows of triangle A152547: a(n) = Sum_{k=0..C(n,[n/2])-1} A152547(n,k)^2.at n=18A152548