1445900625domain: NAppears in sequencesa(n) = (9*n + 6)^4.at n=21A017236a(n) = (10*n + 5)^4.at n=19A017332a(n) = (11*n + 8)^4.at n=17A017488a(n) = (12*n + 3)^4.at n=16A017560Squares composed of two '1-digit' overlapping subsquares.at n=15A048421