Integer part of 4th root of product of first n primes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =13a(7) =26a(8) =55a(9) =122a(10) =283a(11) =669a(12) =1650a(13) =4176a(14) =10694a(15) =28002a(16) =75555a(17) =209402a(18) =585212a(19) =1674296a(20) =4860120a(21) =14206194a(22) =42353033a(23) =127836257a(24) =392646335a(25) =1232237672a(26) =3906383039a(27) =12444691408a(28) =40024883480a(29) =129326254765