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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.

A374453 Number of set-systems S composed of nonempty subsets of [n] such that any element k in S appears at most k times.

Table of values

n a(n)
0 1
1 2
2 6
3 36
4 547
5 26672
6 5120069
7 4581266029
8 21912279450653
9 627026135401140277
10 118043015040470215561725
11 158758107128989643461422723149
12 1641097327889006717487651007699748392

List of values

[1, 2, 6, 36, 547, 26672, 5120069, 4581266029, 21912279450653, 627026135401140277, 118043015040470215561725, 158758107128989643461422723149, 1641097327889006717487651007699748392]

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

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