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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.

A228551 Number of connected labeled graded posets on n vertices.

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 146
5 2820
6 79682
7 3109932
8 163268786
9 11373086100
10 1049057429762
11 128748967088412
12 21220651011079346
13 4747770003765805380
14 1456585782002699624642
15 6390825031791150383749864

List of values

[1, 1, 2, 12, 146, 2820, 79682, 3109932, 163268786, 11373086100, 1049057429762, 128748967088412, 21220651011079346, 4747770003765805380, 1456585782002699624642, 6390825031791150383749864]

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

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