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 A331076 #12 Apr 19 2024 03:27:29 %S A331076 0,1,1,2,3,4,5,8,8,11,11,16,16,19,18,29,24,31,28,39,34,43,36,60,44,57, %T A331076 49,71,55,75,61,93,73,90,71,118,83,107,93,135,95,135,102,152,118,147, %U A331076 112,202,126,169,145,203,139,211,147,233,177,215,160,286 %N A331076 a(n) = Sum_{k = 1..ceiling(n/2)} [u_3(k)*u_3(n+1-k)], where u_3 = A034836. %C A331076 For background references see A330570. %H A331076 Amiram Eldar, <a href="/A331076/b331076.txt">Table of n, a(n) for n = 0..10000</a> %t A331076 s[1] = 1; s[n_] := s[n] = Module[{e = FactorInteger[n][[;; , 2]]}, If[IntegerQ[Surd[n, 3]], 1/3, 0] + (Times @@ ((e + 1)*(e + 2)/2))/6 + (Times @@ (Floor[e/2] + 1))/2]; a[n_] := Sum[s[k] * s[n+1-k], {k, 1, Ceiling[n/2]}]; Array[a, 100, 0] (* _Amiram Eldar_, Apr 19 2024 *) %Y A331076 Cf. A034836. %Y A331076 See A331075 for another version. %K A331076 nonn %O A331076 0,4 %A A331076 _N. J. A. Sloane_, Jan 10 2020 %E A331076 Offset and name corrected by _Amiram Eldar_, Apr 19 2024