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 A078157 #14 Jun 18 2025 21:29:34 %S A078157 0,0,0,2,4,8,13,22,34,52,77,114,166,240,345,494,705,1004,1427,2026, %T A078157 2873,4072,5767,8166,11558,16356,23141,32738,46309,65504,92648,131038, %U A078157 185328,262108,370690,524250,741416,1048536,1482869,2097110,2965777 %N A078157 a(n) = A078152(2^n). %F A078157 For n>1, a(n) = floor(sqrt(2^(n+2))) - n - 2 %Y A078157 Cf. A078152, A078153, A078154, A078155, A078156, A078158. %K A078157 nonn %O A078157 1,4 %A A078157 _Labos Elemer_, Nov 27 2002 %E A078157 Extended by _Robert G. Wilson v_, Dec 02 2002 %E A078157 More terms from _Max Alekseyev_, Feb 12 2012