This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A367493 #9 Nov 20 2023 23:04:58
%S A367493 0,1,8,97,1024,20450,279936,7509953,144295424,4570291850,100000000000,
%T A367493 4491754172274,106993205379072,5221973073321002,171975117132398592,
%U A367493 8931527427394008833,295147905179352825856,20290116242888952838355,708235345355337676357632,51879761166564630630389778
%N A367493 a(n) = Sum_{d|n} (n-d)^n.
%F A367493 a(n) = Sum_{k=0..n} (-1)^k*binomial(n,k)*n^(n-k)*sigma_k(n).
%t A367493 a[n_]:=Sum[(n-d)^n,{d,Divisors[n]}]; Array[a,20] (* _Stefano Spezia_, Nov 20 2023 *)
%o A367493 (Python)
%o A367493 from sympy import divisors
%o A367493 def A367493(n): return sum((n-d)**n for d in divisors(n, generator=True))
%Y A367493 Cf. A094471, A367326, A367327, A367368.
%K A367493 nonn
%O A367493 1,3
%A A367493 _Chai Wah Wu_, Nov 20 2023