cp's OEIS Frontend

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.

A124419 Number of partitions of the set {1,2,...n} having no blocks that contain both odd and even entries.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 4
5 10
6 25
7 75
8 225
9 780
10 2704
11 10556
12 41209
13 178031
14 769129
15 3630780
16 17139600
17 87548580
18 447195609
19 2452523325
20 13450200625
21 78697155750
22 460457244900
23 2859220516290
24 17754399678409
25 116482516809889
26 764214897046969
27 5277304280371714

List of values

[1, 1, 1, 2, 4, 10, 25, 75, 225, 780, 2704, 10556, 41209, 178031, 769129, 3630780, 17139600, 87548580, 447195609, 2452523325, 13450200625, 78697155750, 460457244900, 2859220516290, 17754399678409, 116482516809889, 764214897046969, 5277304280371714]

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

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