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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.

A352969 Start with {1}, then at each step replace it with the set of all pairwise products and sums of its elements (an element can be paired with itself). a(n) gives the number of elements after n-th step.

Table of values

n a(n)
0 1
1 2
2 4
3 11
4 52
5 678
6 67144
7 357306081

List of values

[1, 2, 4, 11, 52, 678, 67144, 357306081]

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

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