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%I #14 Jan 11 2020 15:57:47
%S 0,1,3,7625597484987
%N a(n) = H_5(3,n) where H_n is the n-th hyperoperator.
%C See A054871 for definitions and key links.
%e a(-1)= H_5(3,-1)= 0;
%e a(0) = H_5(3,0) = 1;
%e a(1) = H_5(3,1) = 3;
%e a(2) = H_5(3,2) = H_4(3, H_4(3,1)) = H_4(3,3) = 3^3^3 = 7625597484987;
%t NestList[3^#^3 &, 0, 3] (* _Vincenzo Librandi_, Jan 18 2016 *)
%Y Cf. A014222 (H_4(3,n)), A054871, A266198 (H_5(2,n)).
%K nonn
%O -1,3
%A _Natan Arie Consigli_, Jan 12 2016
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