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.
LINKS
FORMULA
Conjectures from Chai Wah Wu, Jun 06 2024: (Start)
a(n) = a(n-6) + a(n-7) - a(n-13) for n > 15.
G.f.: (-2*x^15 + 3*x^13 + 3*x^12 + 10*x^11 + 13*x^10 + 14*x^9 + 26*x^8 + 25*x^7 + 27*x^6 + 21*x^5 + 14*x^4 + 13*x^3 + 8*x^2 + 4*x + 1)/(x^13 - x^7 - x^6 + 1). (End)
CROSSREFS
KEYWORD
nonn
AUTHOR
Brian Galebach and N. J. A. Sloane, Jun 18 2018
STATUS
approved