%I #11 Jan 29 2018 10:31:00
%S 1,3,7,12,13,17,24,23,27,36,33,37,48,43,47,60,53,57,72,63,67,84,73,77,
%T 96,83,87,108,93,97,120,103,107,132,113,117,144,123,127,156,133,137,
%U 168,143,147,180,153,157,192,163,167,204,173,177,216,183,187,228
%N Coordination sequence for bey tiling (or net) with respect to a trivalent node.
%H Rémy Sigrist, <a href="/A298788/b298788.txt">Table of n, a(n) for n = 0..1000</a>
%H Reticular Chemistry Structure Resource (RCSR), <a href="http://rcsr.net/layers/bey">The bey tiling (or net)</a>
%H Rémy Sigrist, <a href="/A298788/a298788.png">Illustration of the first terms</a>
%H Rémy Sigrist, <a href="/A298788/a298788.gp.txt">PARI program for A298788</a>
%F Conjectures from _Colin Barker_, Jan 29 2018: (Start)
%F G.f.: (1 + x)^2*(1 + x + 4*x^2 + x^3 + x^4) / ((1 - x)^2*(1 + x + x^2)^2).
%F a(n) = 2*a(n-3) - a(n-6) for n>6.
%F (End)
%o (PARI) See Links section.
%Y Cf. A298789, A298790, A298791.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Jan 27 2018
%E More terms from _Rémy Sigrist_, Jan 28 2018