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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.

A381470 Number of simple connected graphs on n unlabeled nodes with exactly 2 non-overlapping cycles.

Table of values

n a(n)
6 1
7 4
8 21
9 85
10 345
11 1289
12 4713
13 16622
14 57535
15 195212
16 653318
17 2158866
18 7063333
19 22906699
20 73742762
21 235863378
22 750187968
23 2374249283
24 7481414941
25 23482536967
26 73449564533
27 229016163367
28 712044375528
29 2208131225648
30 6831543467752
31 21089958138852
32 64978894444220

List of values

[1, 4, 21, 85, 345, 1289, 4713, 16622, 57535, 195212, 653318, 2158866, 7063333, 22906699, 73742762, 235863378, 750187968, 2374249283, 7481414941, 23482536967, 73449564533, 229016163367, 712044375528, 2208131225648, 6831543467752, 21089958138852, 64978894444220]

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

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