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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.

A129271 Number of labeled n-node connected graphs with at most one cycle.

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 31
5 347
6 4956
7 85102
8 1698712
9 38562309
10 980107840
11 27559801736
12 849285938304
13 28459975589311
14 1030366840792576
15 40079074477640850
16 1666985134587145216
17 73827334760713500233
18 3468746291121007607808
19 172335499299097826575564
20 9027150377126199463936000

List of values

[1, 1, 1, 4, 31, 347, 4956, 85102, 1698712, 38562309, 980107840, 27559801736, 849285938304, 28459975589311, 1030366840792576, 40079074477640850, 1666985134587145216, 73827334760713500233, 3468746291121007607808, 172335499299097826575564, 9027150377126199463936000]

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

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