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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.

A215651 Number of transformation semigroups acting on n points (counting conjugates as one), i.e., the number of subsemigroups of the full transformation semigroup T_n.

Table of values

n a(n)
0 1
1 2
2 8
3 283
4 132069776

List of values

[1, 2, 8, 283, 132069776]

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

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