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 A172489 #8 Jun 20 2021 13:20:44 %S A172489 1,6,36,216,46656,2176782336,4738381338321616896, %T A172489 22452257707354557240087211123792674816, %U A172489 504103876157462118901767181449118688686067677834070116931382690099920633856 %N A172489 a(0)=1, a(1)=6; for n>=2, a(n) = 6^A042950(n-2). %Y A172489 Cf. A042950, A167182, A173260, A175129. %K A172489 nonn %O A172489 0,2 %A A172489 _Giovanni Teofilatto_, Feb 05 2010 %E A172489 Revised by _N. J. A. Sloane_, Jun 20 2021