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.

A002968 Number of pairings {(b(1), c(1)), (b(2), c(2)), ..., (b(n), c(n))} of the first 2n positive integers satisfying b(i) < c(i) and such that the 2n numbers c(i)+b(i) and c(i)-b(i) are all distinct.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 8
5 22
6 51
7 342
8 2609
9 16896
10 99114
11 876579
12 8551800
13 79595269
14 764804085
15 8905825760

List of values

[1, 1, 0, 1, 8, 22, 51, 342, 2609, 16896, 99114, 876579, 8551800, 79595269, 764804085, 8905825760]

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

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