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%I #12 Nov 21 2023 08:31:37
%S 2,25,280,6017,107776,3897218,107510656,4867995713,204519070720,
%T 10904505179450,585061309782016,38168392129581810,2481946587976990720,
%U 185404290282527361386,14389574562121084305408,1221867855128546542385409,108430221517525671050739712
%N a(n) = Sum_{d|n} (d+n)^n.
%F a(n) = Sum_{k=0..n} n^(n-k) * binomial(n,k) * sigma_k(n).
%o (PARI) a(n) = sumdiv(n, d, (d+n)^n);
%Y Cf. A163190, A163191, A367493, A367507, A367510.
%K nonn
%O 1,1
%A _Seiichi Manyama_, Nov 21 2023
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