a(n) = (p-1)! mod p^3, where p = prime(n).

Terms

a(0) =1a(1) =2a(2) =24a(3) =34a(4) =494a(5) =675a(6) =4419a(7) =4008a(8) =4944a(9) =13136a(10) =21730a(11) =23531a(12) =14103a(13) =41236a(14) =86432a(15) =77644a(16) =64250a(17) =148534a(18) =243209a(19) =141005a(20) =384490a(21) =373985a(22) =29215a(23) =101281a(24) =543102a(25) =109281a(26) =154396a(27) =1122108a(28) =965630a(29) =1006716