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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.

A340026 Number of connected graphs with n integer labeled vertices covering an initial interval of positive integers.

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 151
5 3845
6 192215
7 18642053
8 3534415032
9 1322914720382
10 983866402492022
11 1458669558830420947
12 4317992152324160500565
13 25541957673530923214876165
14 302031658361424323818453728818
15 7141206379474081326199747144178588
16 337646560987347470614138636684815527025

List of values

[1, 1, 2, 12, 151, 3845, 192215, 18642053, 3534415032, 1322914720382, 983866402492022, 1458669558830420947, 4317992152324160500565, 25541957673530923214876165, 302031658361424323818453728818, 7141206379474081326199747144178588, 337646560987347470614138636684815527025]

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

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