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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.

A154645 a(n) is the ratio of the sum of the squares of the bends of the spheres that are added in the n-th generation of Apollonian packing of three-dimensional spheres, using "strategy (b)" to count them (see the reference), to the sum of the squares of the bends of the initial five mutually tangent spheres.

Table of values

n a(n)
0 1
1 6
2 77
3 1278
4 15978
5 216366

List of values

[1, 6, 77, 1278, 15978, 216366]

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

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