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 A308148 #12 Dec 09 2024 05:49:47 %S A308148 1,2,4,8,14,26,48,88,160,292,532,966,1756,3194,5810,10552,19182,34868, %T A308148 63376,115172,209316,380422,691384,1256538,2283666,4150402,7542974, %U A308148 13708740 %N A308148 Number of length-n binary words avoiding (5+sqrt(5))/2-powers. %C A308148 An e-power, where e is a real number, is a word of length n and period p such that n/p >= e. To avoid an e-power means that no subword (contiguous block) is an e-power. %e A308148 For n = 4, all length-4 binary words avoid (5+sqrt(5))/2 = 3.618... powers except 0000 and 1111. %Y A308148 Cf. A296184 ((5+sqrt(5))/2). %K A308148 nonn,more %O A308148 0,2 %A A308148 _Jeffrey Shallit_, May 14 2019