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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.

A340021 Number of bicolored graphs on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 16
5 66
6 407
7 3948
8 66781
9 2057140
10 117820559
11 12562407832
12 2488441442819
13 915216371901462
14 625792587599236833
15 797474948692631218674
16 1899724021357155410243835
17 8486672841492724213636009230
18 71324140440429733888694354552551
19 1131126439181050621704917376323373818

List of values

[1, 1, 2, 5, 16, 66, 407, 3948, 66781, 2057140, 117820559, 12562407832, 2488441442819, 915216371901462, 625792587599236833, 797474948692631218674, 1899724021357155410243835, 8486672841492724213636009230, 71324140440429733888694354552551, 1131126439181050621704917376323373818]

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

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