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 A018157 #19 Jul 01 2024 17:02:53 %S A018157 1,2,3,5,9,15,26,44,76,131,225,387,665,1142,1964,3375,5801,9970,17137, %T A018157 29454,50625,87013,149555,257051,441813,759375,1305192,2243328, %U A018157 3855769,6627188,11390625,19577886,33649922 %N A018157 Powers of fifth root of 15 rounded to nearest integer. %H A018157 Paolo Xausa, <a href="/A018157/b018157.txt">Table of n, a(n) for n = 0..1000</a> %t A018157 Round[(15^(1/5))^Range[0, 50]] (* _Paolo Xausa_, Jul 01 2024 *) %o A018157 (Python) %o A018157 from gmpy2 import iroot_rem %o A018157 def A018157(n): %o A018157 i, j = iroot_rem(15**n,5) %o A018157 return int(i)+int(j<<5>=10*i*((i*((i*(i+1)<<1)+1)<<2)+1)+1) # _Chai Wah Wu_, Jun 20 2024 %Y A018157 Cf. A011100. %K A018157 nonn %O A018157 0,2 %A A018157 _N. J. A. Sloane_