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 A070564 #16 Jan 10 2025 04:35:23
%S A070564 0,1,1,1,2,2,2,3,3,3,3,3,3,4,4,4,5,5,5,6,6,6,6,6,6,7,7,7,8,8,8,9,9,9,
%T A070564 9,9,9,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,
%U A070564 12,12,12,13,13,13,14,14,14,15,15,15,15,15,15,16,16
%N A070564 Partial sums of A070563.
%H A070564 Amiram Eldar, <a href="/A070564/b070564.txt">Table of n, a(n) for n = 0..10000</a>
%H A070564 Pieter Moree and Herman J.J. te Riele, <a href="https://doi.org/10.1090/S0025-5718-03-01556-4">The hexagonal versus the square lattice</a>, Math. Comp., Vol. 73, No. 245 (2004), 451-473.
%t A070564 Accumulate[Table[Boole[!Divisible[RamanujanTau[n], 3]], {n, 0 ,100}]] (* _Amiram Eldar_, Jan 10 2025 *)
%Y A070564 Cf. A000594, A070563.
%K A070564 nonn
%O A070564 0,5
%A A070564 _N. J. A. Sloane_, May 07 2002