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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.

A273396 Indecomposable collections of multisets with a total of n objects having entries {1,2,...,k} for some k<=n or INVERTi transform of A255906.

Table of values

n a(n)
0 0
1 1
2 3
3 9
4 39
5 201
6 1227
7 8305
8 61383
9 487761
10 4131819
11 37072361
12 350644047
13 3482957945
14 36220558835
15 393329507169
16 4450157382383
17 52354044069009
18 639307054297779
19 8090092395577625
20 105935581968131399
21 1433456549698679385
22 20018656224312123051

List of values

[0, 1, 3, 9, 39, 201, 1227, 8305, 61383, 487761, 4131819, 37072361, 350644047, 3482957945, 36220558835, 393329507169, 4450157382383, 52354044069009, 639307054297779, 8090092395577625, 105935581968131399, 1433456549698679385, 20018656224312123051]

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

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