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 A367507 #10 Nov 21 2023 08:31:34
%S A367507 3,25,152,1633,17050,282594,4785156,101751713,2359920499,62200947098,
%T A367507 1792160571184,56765070083650,1946195069953698,72080471103601322,
%U A367507 2862427829603252768,121449533922042173249,5480386857784931326102,262149577935595805876315
%N A367507 a(n) = Sum_{d|n} (d+2)^n.
%F A367507 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n,k) * sigma_k(n).
%o A367507 (PARI) a(n) = sumdiv(n, d, (d+2)^n);
%Y A367507 Cf. A163190, A163191, A367506, A367509.
%K A367507 nonn
%O A367507 1,1
%A A367507 _Seiichi Manyama_, Nov 21 2023