OFFSET
0,2
COMMENTS
Note that there may be other vertices in the Galebach list of u-uniform tilings with u <= 6 that have this same coordination sequence. See the Galebach link for the complete list of A-numbers for all these tilings.
Conjectures from Colin Barker, Apr 18 2020: (Start)
G.f.: (1 + 2*x + 3*x^2 + 5*x^3 + 5*x^4 + 6*x^5 + 7*x^6 + 7*x^7 + 6*x^8 + 5*x^9 + 4*x^10 + 4*x^11 + 2*x^12 + x^13) / ((1 - x)^2*(1 + x)*(1 + x^2)*(1 + x^4)^2).
a(n) = a(n-1) - a(n-4) + a(n-5) + a(n-8) - a(n-9) + a(n-12) - a(n-13) for n>13.
(End)
LINKS
CROSSREFS
KEYWORD
nonn
AUTHOR
Brian Galebach and N. J. A. Sloane, Jun 18 2018
EXTENSIONS
Edited by Georg Fischer, Apr 17 2020
STATUS
approved