a(n) = n! (mod n^2), that is, n factorial modulo n^2.

Terms

a(0) =0a(1) =2a(2) =6a(3) =8a(4) =20a(5) =0a(6) =42a(7) =0a(8) =0a(9) =0a(10) =110a(11) =0a(12) =156a(13) =0a(14) =0a(15) =0a(16) =272a(17) =0a(18) =342a(19) =0a(20) =0a(21) =0a(22) =506a(23) =0a(24) =0a(25) =0a(26) =0a(27) =0a(28) =812a(29) =0