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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.

A181959 Number of distinct integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed.

Table of values

n a(n)
0 9
1 48
2 236
3 1274
4 6489
5 30229
6 142320
7 711955
8 3601566

List of values

[9, 48, 236, 1274, 6489, 30229, 142320, 711955, 3601566]

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

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