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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.

A002028 Number of connected graphs on n labeled nodes, each node being colored with one of 3 colors, such that no edge joins nodes of the same color.

Table of values

n a(n)
0 1
1 3
2 6
3 42
4 618
5 15990
6 668526
7 43558242
8 4373213298
9 677307561630
10 162826875512646
11 61183069270120842
12 36134310487980825258
13 33673533885068169649830
14 49646105434209446798290206
15 116002075479856331220877149042
16 430053223599741677879550609246498
17 2531493110297317758855120762121050990

List of values

[1, 3, 6, 42, 618, 15990, 668526, 43558242, 4373213298, 677307561630, 162826875512646, 61183069270120842, 36134310487980825258, 33673533885068169649830, 49646105434209446798290206, 116002075479856331220877149042, 430053223599741677879550609246498, 2531493110297317758855120762121050990]

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

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