a(n) = T(n)^2-n!, where T(n) is the n-th triangular number.
A083474
a(n) = T(n)^2-n!, where T(n) is the n-th triangular number.
Terms
- a(0) =0a(1) =7a(2) =30a(3) =76a(4) =105a(5) =-279a(6) =-4256a(7) =-39024a(8) =-360855a(9) =-3625775a(10) =-39912444a(11) =-478995516a(12) =-6227012519a(13) =-87178280175
External references
- oeis: A083474