Triple primorial n### = n#3.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =14a(5) =33a(6) =65a(7) =238a(8) =627a(9) =1495a(10) =6902a(11) =19437a(12) =55315a(13) =282982a(14) =835791a(15) =2599805a(16) =14998046a(17) =49311669a(18) =158588105a(19) =1004869082a(20) =3501128499a(21) =11576931665a(22) =79384657478a(23) =290593665417