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 A092442 #7 Mar 21 2016 08:18:25 %S A092442 0,1,5,19,59,161,405,967,2231,5029,11153,24443,53091,114505,245549, %T A092442 524047,1113839,2358989,4980393,10485379,22019675,46136881,96468485, %U A092442 201326039,419429799,872414581,1811938625,3758095627,7784627411 %N A092442 Sequence arising from enumeration of domino tilings of Aztec Pillow-like regions. %C A092442 Differences give A066368. %D A092442 J. Propp, Enumeration of matchings: problems and progress, pp. 255-291 in L. J. Billera et al., eds, New Perspectives in Algebraic Combinatorics, Cambridge, 1999 (see Problem 13). %H A092442 J. Propp, <a href="http://faculty.uml.edu/jpropp/articles.html">Publications and Preprints</a> %H A092442 J. Propp, Enumeration of matchings: problems and progress, in L. J. Billera et al. (eds.), <a href="http://www.msri.org/publications/books/Book38/contents.html">New Perspectives in Algebraic Combinatorics</a> %H A092442 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (7,-19,25,-16,4). %F A092442 a(n)=(n+1)(2^n-1)-n^2. %F A092442 G.f.:(x*(4*x^3-3*x^2+2*x-1))/((2*x-1)^2*(x-1)^3) [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009] %e A092442 a(3)=4(2^3-1)-3^2=19. %Y A092442 Cf. A092437-A092443. %K A092442 easy,nonn %O A092442 0,3 %A A092442 Christopher Hanusa (chanusa(AT)math.washington.edu), Mar 24 2004