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 A143653 #7 Mar 31 2012 08:51:14 %S A143653 0,81,15625,117649,81,2384185791015625,549755813888,2097152,390625, %T A143653 24137569,274877906944,32768,3909821048582988049,148035889,59049, %U A143653 549755813888,81,10367793076318844190248738727596255138212949486449 %N A143653 (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13,..) becomes (0^(1*2), 3^(2*2), 5^(2*3), 7^(2*3), 3^(2*2), 5^(11*2), 2^(3*13),..). %e A143653 0^(1*2)=0^2=0=a(1). %e A143653 3^(2*2)=3^4=81=a(2). %e A143653 5^(2*3)=5^6=15625=a(3). %e A143653 7^(2*3) =7^6=117649=a(4). %e A143653 3^(2*2)=3^4=81=a(5). %e A143653 5^(11*2)=5^22=2384185791015625=a(6). %e A143653 2^(3*13) =2^39=549755813888=a(7). %e A143653 2^(7*3)=2^21=2097152=a(8), etc. %Y A143653 Cf. A141269, A141270. %K A143653 nonn,less %O A143653 1,2 %A A143653 _Juri-Stepan Gerasimov_, Nov 01 2008 %E A143653 a(6), a(11) corrected, extended by _R. J. Mathar_, Nov 06 2008