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 A363317 #13 Jul 08 2023 08:05:02
%S A363317 1,6,10,14,18,22,31,30,34,38,42,60,50,54,58,62,84,70,74,78,91,108,90,
%T A363317 94,98,102,132,110,114,140,122,156,130,134,138,142,180,150,180,158,
%U A363317 162,204,183,174,178,182,228,220,194,198,202,252,210,214,218,252,310,230,234,238,242,300,250,254,258,300,324
%N A363317 Sum of divisors of 4*n-3 of form 4*k+1.
%F A363317 a(n) = A050449(4*n-3).
%F A363317 G.f.: Sum_{k>0} (4*k-3) * x^k / (1 - x^(4*k-3)).
%t A363317 a[n_] := DivisorSum[4*n - 3, # &, Mod[#, 4] == 1 &]; Array[a, 100] (* _Amiram Eldar_, Jul 08 2023 *)
%o A363317 (PARI) a(n) = sumdiv(4*n-3, d, (d%4==1)*d);
%Y A363317 Cf. A050449, A359227, A364083.
%K A363317 nonn
%O A363317 1,2
%A A363317 _Seiichi Manyama_, Jul 08 2023