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 A164238 #6 Jul 22 2025 07:13:39 %S A164238 1,2,4,8,16,30,56,104,194,363,682,1286,2432,4612,8766,16701,31887, %T A164238 61017,117001,224812,432789,834689,1612548,3120361,6047274,11736581, %U A164238 22809338,44385205,86473743,168662839,329316660,643634073,1259124723,2465346235 %N A164238 Number of binary strings of length n with equal numbers of 00100 and 01101 substrings. %C A164238 Exactly 2 adjacent element pairs in decreasing order gives A027540 %H A164238 R. H. Hardin, <a href="/A164238/b164238.txt">Table of n, a(n) for n=0..500</a> %K A164238 nonn %O A164238 0,2 %A A164238 _R. H. Hardin_ Aug 11 2009