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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.

A327231 Number of labeled simple connected graphs covering a subset of {1..n} with at least one non-endpoint bridge (non-spanning edge-connectivity 1).

Table of values

n a(n)
0 0
1 0
2 1
3 3
4 18
5 250
6 5475
7 191541
8 11065572
9 1104254964
10 201167132805
11 69828691941415
12 47150542741904118
13 62354150876493659118
14 161919876753750972738791
15 827272271567137357352991705
16 8331016130913639432634637862600
17 165634930763383717802534343776893928

List of values

[0, 0, 1, 3, 18, 250, 5475, 191541, 11065572, 1104254964, 201167132805, 69828691941415, 47150542741904118, 62354150876493659118, 161919876753750972738791, 827272271567137357352991705, 8331016130913639432634637862600, 165634930763383717802534343776893928]

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

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