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 A288031 #10 Jun 11 2017 18:51:09 %S A288031 1,43,969,23663,571099,13807469,333735575,8066926825,194989463233, %T A288031 4713185791699,113924706164937,2753729539353359,66561737202707371, %U A288031 1608896152717277333,38889412128248718215,940014912175876488361,22721558047666401897553,549213840574693856578267 %N A288031 Number of edge covers in the grid graph P_3 X P_n. %H A288031 Andrew Howroyd, <a href="/A288031/b288031.txt">Table of n, a(n) for n = 1..200</a> %F A288031 Empirical: a(n) = 20*a(n-1)+100*a(n-2)+24*a(n-3) -95*a(n-4)+10*a(n-5)+8*a(n-6) for n>6. %F A288031 Empirical g.f.: x*(1 + 23*x + 9*x^2 - 41*x^3 + 2*x^4 + 8*x^5) / (1 - 20*x - 100*x^2 - 24*x^3 + 95*x^4 - 10*x^5 - 8*x^6). - _Colin Barker_, Jun 11 2017 %Y A288031 Row 3 of A286912. %Y A288031 Cf. A286911, A286913. %K A288031 nonn %O A288031 1,2 %A A288031 _Andrew Howroyd_, Jun 04 2017