165809592domain: NAppears in sequencesa(n) = (1/2!)*3^n*(n+3)*(n).at n=12A288835Numbers with prime factorization of the form p_1^p_2*p_2^p_3*...p_(n-1)^p_n*p_n where p_(n-1) < p(n) and n > 1.at n=17A294110