cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A187068 Let i be in {1,2,3}, let r >= 0 be an integer and n=2*r+i-1. Then a(n)=a(2*r+i-1) gives the quantity of H_(7,1,0) tiles in a subdivided H_(7,i,r) tile after linear scaling by the factor x^r, where x=sqrt((2*cos(Pi/7))^2-1).

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 1
5 1
6 1
7 2
8 3
9 5
10 6
11 11
12 14
13 25
14 31
15 56
16 70
17 126
18 157
19 283
20 353
21 636
22 793
23 1429
24 1782
25 3211
26 4004
27 7215
28 8997
29 16212
30 20216
31 36428
32 45425
33 81853
34 102069
35 183922
36 229347
37 413269
38 515338
39 928607
40 1157954
41 2086561
42 2601899

List of values

[1, 0, 0, 0, 1, 1, 1, 2, 3, 5, 6, 11, 14, 25, 31, 56, 70, 126, 157, 283, 353, 636, 793, 1429, 1782, 3211, 4004, 7215, 8997, 16212, 20216, 36428, 45425, 81853, 102069, 183922, 229347, 413269, 515338, 928607, 1157954, 2086561, 2601899]