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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.

A181960 Number of distinct nonnegative 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 40
2 156
3 740
4 3668
5 16948
6 77861
7 379084
8 1889419

List of values

[9, 40, 156, 740, 3668, 16948, 77861, 379084, 1889419]

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

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