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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.

A154636 a(n) is the ratio of the sum of the bends of the circles that are drawn in the n-th generation of Apollonian packing to the sum of the bends of the circles in the initial configuration of 3 circles.

Table of values

n a(n)
0 1
1 2
2 18
3 138
4 1050
5 7986
6 60738
7 461946
8 3513354
9 26720994
10 203227890
11 1545660138
12 11755597434
13 89407799058
14 679995600162
15 5171741404122
16 39333944432490
17 299156331247554
18 2275248816682962
19 17304521539721034
20 131610425867719386
21 1000969842322591986

List of values

[1, 2, 18, 138, 1050, 7986, 60738, 461946, 3513354, 26720994, 203227890, 1545660138, 11755597434, 89407799058, 679995600162, 5171741404122, 39333944432490, 299156331247554, 2275248816682962, 17304521539721034, 131610425867719386, 1000969842322591986]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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