Number of proper factorizations of p1^n*p2^3, where p1 and p2 are distinct primes.

Terms

a(0) =2a(1) =6a(2) =15a(3) =30a(4) =56a(5) =96a(6) =161a(7) =256a(8) =400a(9) =607a(10) =906a(11) =1324a(12) =1913a(13) =2718a(14) =3823a(15) =5312a(16) =7315a(17) =9972a(18) =13494a(19) =18104a(20) =24131a(21) =31937a(22) =42020a(23) =54947a(24) =71483a(25) =92491a(26) =119119a(27) =152685a(28) =194886a(29) =247692