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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.

A357891 a(1) = 1; a(n+1) is the smallest integer > 0 that cannot be obtained from the integers {a(1), ..., a(n)} using each number exactly once and the operators +, -, *, /.

Table of values

n a(n)
1 1
2 2
3 4
4 11
5 34
6 152
7 1079
8 6610
9 93221

List of values

[1, 2, 4, 11, 34, 152, 1079, 6610, 93221]

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

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