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 A331074 #17 Jun 20 2025 00:22:59
%S A331074 0,1,3,12,15,30,36,75,64,108,102,198,147,237,201,361,255,435,318,552,
%T A331074 417,630,459,963,537,888,696,1099,714,1302,810,1503,1044,1506,1000,
%U A331074 2103,1119,1869,1443,2337,1344,2568,1464,2697,1884,2676,1710,3966,1839,3150,2400,3714,2115,4189,2292,4359,2943,4098
%N A331074 a(n) = Sum_{k = 1..ceiling(n/2)} [d_3(k)*d_3(n+1-k)], where d_3 = A007425.
%C A331074 For background references see A330570.
%H A331074 Amiram Eldar, <a href="/A331074/b331074.txt">Table of n, a(n) for n = 0..10000</a>
%t A331074 f[p_, e_] := (e+1)*(e+2)/2; s[1] = 1; s[n_] := s[n] = Times @@ f @@@ FactorInteger[n]; a[n_] := Sum[s[k] * s[n+1-k], {k, 1, Ceiling[n/2]}]; Array[a, 100, 0] (* _Amiram Eldar_, Apr 19 2024 *)
%Y A331074 Cf. A007425.
%Y A331074 See A331073 for another version.
%K A331074 nonn
%O A331074 0,3
%A A331074 _N. J. A. Sloane_, Jan 10 2020
%E A331074 Offset and name corrected by _Amiram Eldar_, Apr 19 2024