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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.

A102508 Suppose there are equally spaced chairs around a round table. Then a(n) is the maximal number of chairs for which there exists a seating arrangement of n people around the table such that if a waiter puts two glasses (randomly) on the table in front of two (different) chairs, it is always possible to turn the table so that the two glasses end up in front of two seated persons.

Table of values

n a(n)
1 1
2 3
3 7
4 13
5 21
6 31
7 39
8 57
9 73
10 91
11 95
12 133

List of values

[1, 3, 7, 13, 21, 31, 39, 57, 73, 91, 95, 133]

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

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