A310518 - OEIS

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A310518

Coordination sequence Gal.3.21.1 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, 26, 30, 36, 42, 48, 52, 56, 62, 68, 74, 78, 82, 88, 94, 100, 104, 108, 114, 120, 126, 130, 134, 140, 146, 152, 156, 160, 166, 172, 178, 182, 186, 192, 198, 204, 208, 212, 218, 224, 230, 234, 238, 244, 250, 256

(list; graph; refs; listen; history; text; internal format)

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) = a(n-1) + a(n-5) - a(n-6) for n > 6.

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

CROSSREFS

Sequence in context: A291745 A176262 A310517 * A310519 A310520 A310521

Adjacent sequences: A310515 A310516 A310517 * A310519 A310520 A310521

KEYWORD

nonn

AUTHOR

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

STATUS

approved