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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.

A154637 a(n) is the ratio of the sum of squares of the bends of the circles that are added in the n-th generation of Apollonian packing, to the sum of squares of the bends of the initial three circles.

Table of values

n a(n)
0 1
1 2
2 66
3 1314
4 26082
5 517698
6 10275714
7 203961186
8 4048396578
9 80356048002
10 1594975770306
11 31658447262114
12 628384017931362
13 12472705016840898
14 247568948283023874
15 4913960850609954786
16 97536510167350024098
17 1935988320795170617602
18 38427156885401362279746
19 762735172745641733742114

List of values

[1, 2, 66, 1314, 26082, 517698, 10275714, 203961186, 4048396578, 80356048002, 1594975770306, 31658447262114, 628384017931362, 12472705016840898, 247568948283023874, 4913960850609954786, 97536510167350024098, 1935988320795170617602, 38427156885401362279746, 762735172745641733742114]

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

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