A310525 Coordination sequence Gal.4.74.1 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, 4, 10, 16, 22, 28, 32, 36, 42, 48, 54, 60, 64, 68, 74, 80, 86, 92, 96, 100, 106, 112, 118, 124, 128, 132, 138, 144, 150, 156, 160, 164, 170, 176, 182, 188, 192, 196, 202, 208, 214, 220, 224, 228, 234, 240, 246, 252, 256, 260

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, Jan 24 2020: (Start)

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

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

Crossrefs

Sequence in context: A140493 A219239 A141427 * A310526 A310527 A310528

Adjacent sequences: A310522 A310523 A310524 * A310526 A310527 A310528

Keyword

nonn

Author

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

Status

approved