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 A174313 #16 Jan 03 2019 03:11:16 %S A174313 1,6,18,54,162,474,1398,4074,11898,34554,100302,290322,839382,2422626, %T A174313 6984342,20110806,57851358,166258242,477419658,1369878582,3927963138, %U A174313 11255743434,32235116502,92267490414,263968559874,754837708494,2157584748150,6164626128066,17606866229010 %N A174313 Number of n-step walks on hexagonal lattice (no points repeated, no adjacent points unless consecutive in path). %C A174313 The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice. %C A174313 Fisher and Hiley give 290334 and 839466 as their last terms instead of 290322 and 839382 (see A002933). Douglas McNeil confirms the correction on the seqfan list Nov 27 2010. %D A174313 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A174313 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A174313 M. E. Fisher and B. J. Hiley, <a href="http://dx.doi.org/10.1063/1.1731729">Configuration and free energy of a polymer molecule with solvent interaction</a>, J. Chem. Phys., 34 (1961), 1253-1267. %H A174313 G. Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/A2.html">Home page for hexagonal (or triangular) lattice A2</a> %Y A174313 Cf. A173380 for square lattice equivalent. %K A174313 nonn,walk %O A174313 0,2 %A A174313 _Joseph Myers_, Nov 27 2010 %E A174313 a(19)-a(28) from _Bert Dobbelaere_, Jan 02 2019