login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A301684 Coordination sequence for node of type V2 in "krg" 2-D tiling (or net). 38
1, 4, 8, 12, 18, 22, 28, 34, 36, 42, 48, 50, 56, 62, 64, 70, 76, 78, 84, 90, 92, 98, 104, 106, 112, 118, 120, 126, 132, 134, 140, 146, 148, 154, 160, 162, 168, 174, 176, 182, 188, 190, 196, 202, 204, 210, 216, 218, 224, 230, 232, 238, 244, 246, 252, 258, 260, 266, 272, 274, 280, 286, 288, 294, 300, 302, 308, 314, 316, 322, 328, 330, 336, 342, 344, 350, 356, 358, 364, 370, 372, 378, 384, 386, 392, 398, 400, 406, 412, 414, 420, 426, 428, 434, 440, 442, 448, 454, 456, 462, 468 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987. See Table 2.2.1, page 66, 2nd row, 2nd tiling.

LINKS

Table of n, a(n) for n=0..100.

Brian Galebach, Collection of n-Uniform Tilings. See Number 10 from the list of 20 2-uniform tilings.

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

Reticular Chemistry Structure Resource (RCSR), The krg tiling (or net)

FORMULA

Conjecture: G.f. = -(2*x^8-2*x^6-3*x^4-3*x^3-4*x^2-3*x-1)/(x^4-x^3-x+1). - N. J. A. Sloane, Mar 29 2018

CROSSREFS

Cf. A301682.

Coordination sequences for the 20 2-uniform tilings in the order in which they appear in the Galebach catalog, together with their names in the RCSR database (two sequences per tiling): #1 krt A265035, A265036; #2 cph A301287, A301289; #3 krm A301291, A301293; #4 krl A301298, A298024; #5 krq A301299, A301301; #6 krs A301674, A301676; #7 krr A301670, A301672; #8 krk A301291, A301293; #9 krn A301678, A301680; #10 krg A301682, A301684; #11 bew A008574, A296910; #12 krh A301686, A301688; #13 krf A301690, A301692; #14 krd A301694, A219529; #15 krc A301708, A301710; #16 usm A301712, A301714; #17 krj A219529, A301697; #18 kre A301716, A301718; #19 krb A301720, A301722; #20 kra A301724, A301726.

Sequence in context: A311611 A311612 A311613 * A311614 A311615 A311616

Adjacent sequences:  A301681 A301682 A301683 * A301685 A301686 A301687

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 25 2018

EXTENSIONS

a(11)-a(100) from Davide M. Proserpio, Mar 28 2018

DATA section contains 100 terms - this was deliberate. If you want to shorten this section, kindly add a b-file first. - N. J. A. Sloane, Mar 29 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 24 11:38 EDT 2021. Contains 347642 sequences. (Running on oeis4.)