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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.

A000798 Number of different quasi-orders (or topologies, or transitive digraphs) with n labeled elements.

Table of values

n a(n)
0 1
1 1
2 4
3 29
4 355
5 6942
6 209527
7 9535241
8 642779354
9 63260289423
10 8977053873043
11 1816846038736192
12 519355571065774021
13 207881393656668953041
14 115617051977054267807460
15 88736269118586244492485121
16 93411113411710039565210494095
17 134137950093337880672321868725846
18 261492535743634374805066126901117203

List of values

[1, 1, 4, 29, 355, 6942, 209527, 9535241, 642779354, 63260289423, 8977053873043, 1816846038736192, 519355571065774021, 207881393656668953041, 115617051977054267807460, 88736269118586244492485121, 93411113411710039565210494095, 134137950093337880672321868725846, 261492535743634374805066126901117203]

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

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