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 A254401 #6 Aug 11 2021 17:54:47
%S A254401 3,5,11,40,260,4198,272087,141926645,1690814280107,
%T A254401 2198588037458589676,3259986420078467245024559414,
%U A254401 186133132558073401497122370072981441415771,80303695148132102394972761166781400472084090796880334009212493
%N A254401 a(n) = floor(b(n)), where b(n) = b(n-1)^(3/2), b(1) = 3.
%F A254401 a(n) = floor(3^((3/2)^(n-1))).
%t A254401 Floor[RecurrenceTable[{a[1]==3,a[n]==a[n-1]^(3/2)},a,{n,1,15}]]
%t A254401 Table[Floor[3^((3/2)^(n-1))], {n, 1, 15}
%t A254401 Floor[NestList[#^(3/2)&,3,15]] (* _Harvey P. Dale_, Aug 11 2021 *)]
%Y A254401 Cf. A254402.
%K A254401 nonn,easy
%O A254401 1,1
%A A254401 _Vaclav Kotesovec_, Jan 30 2015