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 A261146 #7 Jan 11 2020 15:57:47 %S A261146 4,4,6,27, %T A261146 13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096 %N A261146 H_n(n,3) where H_n is the n-th hyperoperator. %C A261146 For hyperoperator definitions and links, see A054871. %e A261146 H_0(0,3) = 3+1 = 4; %e A261146 H_1(1,3) = 1+3 = 4; %e A261146 H_2(2,3) = 2*3 = 6; %e A261146 H_3(3,3) = 3^3 = 27; %e A261146 H_4(4,3) = 4^^3 = 4^4^4 = 4^256 = 13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096. %K A261146 nonn %O A261146 0,1 %A A261146 _Natan Arie Consigli_, Oct 25 2015