cp's OEIS Frontend

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.

A001173 Half the number of binary relations on n unlabeled points.

Table of values

n a(n)
1 1
2 5
3 52
4 1522
5 145984
6 48464496
7 56141454464
8 229148550030864
9 3333310786076963968
10 174695272746749919580928
11 33301710992539090379269318144
12 23278728241293494533015563325552128
13 60084295633556503802059558812644803074048
14 576025077880237078776946730871618386151571214336

List of values

[1, 5, 52, 1522, 145984, 48464496, 56141454464, 229148550030864, 3333310786076963968, 174695272746749919580928, 33301710992539090379269318144, 23278728241293494533015563325552128, 60084295633556503802059558812644803074048, 576025077880237078776946730871618386151571214336]

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

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