A393474 - OEIS

%I #14 Feb 22 2026 15:48:03

%S 8,96,342,2432,5290,12312,30576,75264,97848,182760,323070,399456,

%T 779090,1047424,1052280,2398208,3068024,3009312,5339190,5892000,

%U 6178410,10670264,14117952,12804480,18601000,25062024,23279886,33793536,46101938,31808160,64117920,76701696,61445736

%N Row sums of A393016.

%C The sequence appears to grow on the order of n^4.

%C All terms are even.

%H Vincenzo Librandi, <a href="/A393474/b393474.txt">Table of n, a(n) for n = 1..1000</a>

%t T[n_,k_]:=Numerator[(8 n^3 k)/(k^2+4 n^2)]; a[n_]:=Sum[T[n,k],{k,1,n}]; Table[a[n],{n,1,30}]

%o (Magma) a := function(n) return &+[Numerator((8*n^3*k)/(k^2+4*n^2)) : k in [1..n]]; end function; [a(n) : n in [1..35]];

%Y Cf. A393016.

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Feb 16 2026