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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.

A191371 Number of simple labeled graphs with (at most) 3-colored nodes such that no edge connects two nodes of the same color.

Table of values

n a(n)
0 1
1 3
2 15
3 123
4 1635
5 35043
6 1206915
7 66622083
8 5884188675
9 830476531203
10 187106645932035
11 67241729173555203
12 38521811621470420995
13 35161184767296890265603
14 51112793797110111859802115
15 118291368253025368001553530883
16 435713124846749574718274002747395
17 2553666761436949125065383836043837443

List of values

[1, 3, 15, 123, 1635, 35043, 1206915, 66622083, 5884188675, 830476531203, 187106645932035, 67241729173555203, 38521811621470420995, 35161184767296890265603, 51112793797110111859802115, 118291368253025368001553530883, 435713124846749574718274002747395, 2553666761436949125065383836043837443]

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

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