A315320 Coordination sequence Gal.4.135.2 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.

1, 6, 10, 16, 21, 26, 32, 36, 42, 48, 52, 58, 63, 68, 74, 78, 84, 90, 94, 100, 105, 110, 116, 120, 126, 132, 136, 142, 147, 152, 158, 162, 168, 174, 178, 184, 189, 194, 200, 204, 210, 216, 220, 226, 231, 236, 242, 246, 252, 258

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

Table of n, a(n) for n=0..49.

Brian Galebach, k-uniform tilings (k <= 6) and their A-numbers

Formula

Conjectures from Chai Wah Wu, Oct 19 2020: (Start)

a(n) = 2*a(n-1) - 2*a(n-2) + 2*a(n-3) - 2*a(n-4) + 2*a(n-5) - 2*a(n-6) + 2*a(n-7) - a(n-8) for n > 8.

G.f.: (x^8 + 4*x^7 + 6*x^5 - x^4 + 6*x^3 + 4*x + 1)/((x - 1)^2*(x^2 + 1)*(x^4 + 1)). (End)

Crossrefs

Sequence in context: A315317 A315318 A315319 * A315321 A315322 A315323

Adjacent sequences: A315317 A315318 A315319 * A315321 A315322 A315323

Keyword

nonn

Author

Brian Galebach and N. J. A. Sloane, Jun 18 2018

Status

approved