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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.

A245731 Number of connected labeled transitive relations on an n-set.

Table of values

n a(n)
0 1
1 2
2 9
3 109
4 2647
5 110481
6 7291543
7 726434549
8 106312974249
9 22465350835849
10 6771847676632679
11 2883916106465622053
12 1720792953946798909927
13 1427968172285571102335605
14 1637002867699829205840095585
15 2577011453377960519672777065693
16 5541005747990556022043234479371823
17 16195114271558690956785525865003941945
18 64068293759315414337050896928055465961863

List of values

[1, 2, 9, 109, 2647, 110481, 7291543, 726434549, 106312974249, 22465350835849, 6771847676632679, 2883916106465622053, 1720792953946798909927, 1427968172285571102335605, 1637002867699829205840095585, 2577011453377960519672777065693, 5541005747990556022043234479371823, 16195114271558690956785525865003941945, 64068293759315414337050896928055465961863]

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

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