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 A064416 #9 Jan 08 2025 10:02:07 %S A064416 1,2,5,11,26,59,137,312,719,1651,3816,8757,20202,46440,106957,245989, %T A064416 566561,1303968,3002247,6910122,15909143 %N A064416 Number of integers q such that phiter(q)=n where phiter(n) = A064415(n). %H A064416 Hartosh Singh Bal, <a href="https://arxiv.org/abs/2308.00455">Combinatorics of a Class of Completely Additive Arithmetic Functions</a>, arXiv:2308.00455 [math.CO], 2023. See Table 12 p. 17. %F A064416 If 2<=n<=6, a(n)=a(n-1)+3*a(n-2). %Y A064416 Cf. A000010, A064415. %K A064416 nonn,more %O A064416 0,2 %A A064416 Christian WEINSBERG (cweinsbe(AT)fr.packardbell.org), Sep 30 2001 %E A064416 a(14)-a(20) from _Sean A. Irvine_, Jul 07 2023