Quintuple primorial n##### = n#5.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =11a(6) =26a(7) =51a(8) =95a(9) =161a(10) =319a(11) =806a(12) =1887a(13) =3895a(14) =6923a(15) =14993a(16) =42718a(17) =111333a(18) =237595a(19) =463841a(20) =1064503a(21) =3118414a(22) =8795307a(23) =19720385a(24) =41281849a(25) =103256791a(26) =314959814a(27) =905916621a(28) =2110081195a(29) =4499721541