# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a164175 Showing 1-1 of 1 %I A164175 #11 Oct 23 2017 14:42:45 %S A164175 1,2,4,8,14,24,44,84,160,304,582,1124,2180,4236,8248,16096,31468, %T A164175 61600,120712,236776,464832,913216,1795270,3531324,6949852,13684364, %U A164175 26956792,53124240,104733796,206557360,407516744,804254360,1587733632,3135392096 %N A164175 Number of binary strings of length n with equal numbers of 0011 and 1100 substrings. %H A164175 R. H. Hardin, Table of n, a(n) for n=0..500 %H A164175 Shalosh B. Ekhad and Doron Zeilberger, Automatic Solution of Richard Stanley's Amer. Math. Monthly Problem #11610 and ANY Problem of That Type, arXiv preprint arXiv:1112.6207, 2011. See subpages for rigorous derivations of g.f., recurrence, asymptotics for this sequence. [From _N. J. A. Sloane_, Apr 07 2012] %K A164175 nonn %O A164175 0,2 %A A164175 _R. H. Hardin_, Aug 11 2009 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE