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 A048134 #18 Mar 21 2019 02:38:53
%S A048134 0,3,6,13,22,40,55,88,118,163,205,280,334,436,517,625,733,901,1018,
%T A048134 1225,1381,1591,1786,2083,2287,2617,2887,3238,3544,4006,4306,4831,
%U A048134 5239,5749,6205,6817,7267,8005,8572,9280,9880,10780,11374,12361
%N A048134 Number of colors that can be mixed with up to n units of yellow, blue, red.
%H A048134 T. D. Noe, <a href="/A048134/b048134.txt">Table of n, a(n) for n = 0..1000</a>
%F A048134 a(n) = number of triples (i, j, k) with 1 <= i+j+k <= n and gcd(i, j, k) = 1.
%F A048134 Cumulative sums of A048240(k) for k>0.
%e A048134 a(2)=6: primary and secondary colors (Y^1, B^1, R^1, Y^1*B^1, Y^1*R^1, B^1*R^1).
%t A048134 Accumulate[ Table[ Sum[ MoebiusMu[n/d]*(d + 1)*(d + 2)/2, {d, Divisors[n]}], {n, 0, 43}]] (* _Jean-François Alcover_, Jul 16 2012, after _Vladeta Jovovic_ *)
%Y A048134 Two colors gives A005728.
%Y A048134 Cf. A048240, A048241.
%K A048134 nonn,nice,easy
%O A048134 0,2
%A A048134 _Jurjen N.E. Bos_
%E A048134 More terms from Robin Trew (trew(AT)hcs.harvard.edu).