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A312981
Coordination sequence Gal.5.146.4 where Gal.u.t.v denotes the coordination sequence for a vertex of type v in tiling number t in the Galebach list of u-uniform tilings.
0
1, 4, 9, 13, 20, 22, 28, 31, 35, 44, 44, 52, 53, 57, 68, 66, 76, 75, 79, 92, 88, 100, 97, 101, 116, 110, 124, 119, 123, 140, 132, 148, 141, 145, 164, 154, 172, 163, 167, 188, 176, 196, 185, 189, 212, 198, 220, 207, 211, 236
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.
FORMULA
Conjectures from Chai Wah Wu, Jan 04 2020: (Start)
a(n) = 2*a(n-5) - a(n-10) for n > 10.
G.f.: (x^10 + 4*x^9 + 9*x^8 + 13*x^7 + 20*x^6 + 20*x^5 + 20*x^4 + 13*x^3 + 9*x^2 + 4*x + 1)/(x^10 - 2*x^5 + 1). (End)
CROSSREFS
Sequence in context: A035104 A141224 A064423 * A312982 A312983 A312984
KEYWORD
nonn
AUTHOR
STATUS
approved