a(n) = floor(e*(n+3)!) - (n+3)*(n+2)*(n+1)*n*floor(e*(n-1)!).

Terms

a(0) =17a(1) =86a(2) =157a(3) =260a(4) =401a(5) =586a(6) =821a(7) =1112a(8) =1465a(9) =1886a(10) =2381a(11) =2956a(12) =3617a(13) =4370a(14) =5221a(15) =6176a(16) =7241a(17) =8422a(18) =9725a(19) =11156a(20) =12721a(21) =14426a(22) =16277a(23) =18280a(24) =20441a(25) =22766a(26) =25261a(27) =27932a(28) =30785a(29) =33826