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 A197190 #29 Jan 23 2025 17:43:01 %S A197190 2,1,3,18,47,15127,322,599074578,4870847,192900153618,228826127, %T A197190 97418273275323406890123,10749957122, %U A197190 400010949097364802732720796316482,358890350005878082,11981655542024930675232002,562882766124611619513723647,699259133978938420550028971714417160188479526095241271647 %N A197190 a(0) = 2, a(n) = Lucas(phi(n^2)) for n > 0. %H A197190 Vincenzo Librandi, <a href="/A197190/b197190.txt">Table of n, a(n) for n = 0..60</a> %F A197190 a(n) = A000032(A002618(n)) for n > 0. %o A197190 (Magma) [2] cat [Lucas(EulerPhi(n^2)): n in [1..20]]; %Y A197190 Cf. A000010, A000032, A002618, A197218, A197219. %K A197190 nonn %O A197190 0,1 %A A197190 _Vincenzo Librandi_, Oct 13 2011