Septuple factorial, 7-factorial, n!7, n!!!!!!!, a(n) = n*a(n-7) if n > 1, else 1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =18a(10) =30a(11) =44a(12) =60a(13) =78a(14) =98a(15) =120a(16) =288a(17) =510a(18) =792a(19) =1140a(20) =1560a(21) =2058a(22) =2640a(23) =6624a(24) =12240a(25) =19800a(26) =29640a(27) =42120a(28) =57624a(29) =76560