A315557 Coordination sequence Gal.6.663.6 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, 11, 18, 22, 27, 31, 41, 47, 48, 54, 59, 68, 72, 78, 85, 88, 94, 97, 105, 113, 119, 122, 124, 131, 138, 146, 150, 157, 162, 164, 169, 175, 187, 191, 194, 198, 201, 210, 216, 224, 229, 234, 238, 239, 247, 257, 265, 266, 270

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 12 2023: (Start)

a(n) = a(n-7) + a(n-13) - a(n-20) for n > 20.

G.f.: (x^20 + 6*x^19 + 11*x^18 + 18*x^17 + 22*x^16 + 27*x^15 + 31*x^14 + 40*x^13 + 41*x^12 + 37*x^11 + 36*x^10 + 37*x^9 + 41*x^8 + 40*x^7 + 31*x^6 + 27*x^5 + 22*x^4 + 18*x^3 + 11*x^2 + 6*x + 1)/(x^20 - x^13 - x^7 + 1). (End)

Crossrefs

Sequence in context: A099225 A315555 A315556 * A315558 A315559 A315560

Adjacent sequences: A315554 A315555 A315556 * A315558 A315559 A315560

Keyword

nonn

Author

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

Status

approved