Quadruple primorial n#### = n#4.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =22a(6) =39a(7) =85a(8) =133a(9) =506a(10) =1131a(11) =2635a(12) =4921a(13) =20746a(14) =48633a(15) =123845a(16) =260813a(17) =1224014a(18) =2966613a(19) =8297615a(20) =18517723a(21) =89353022a(22) =234362427a(23) =688702045a(24) =1648077347a(25) =8667243134a(26) =23670605127a(27) =70936310635a(28) =176344276129