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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.

A154640 a(n) is the number of spheres that are added in the n-th generation of Apollonian packing of three-dimensional spheres, starting with five mutually tangent spheres and using "strategy (a)" to count them (see the reference).

Table of values

n a(n)
0 5
1 5
2 20
3 60
4 210
5 690
6 3330

List of values

[5, 5, 20, 60, 210, 690, 3330]

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

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