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.

A180779 Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.

Table of values

n a(n)
1 0
2 1
3 15
4 327
5 4856
6 53455
7 444003
8 2948305
9 16112289
10 75389116
11 307372600
12 1122069080
13 3701885580
14 11258893954
15 31699979961
16 83910860201
17 209004408715
18 496246703439
19 1121475446118
20 2440154664350
21 5096346969372
22 10323359668079

List of values

[0, 1, 15, 327, 4856, 53455, 444003, 2948305, 16112289, 75389116, 307372600, 1122069080, 3701885580, 11258893954, 31699979961, 83910860201, 209004408715, 496246703439, 1121475446118, 2440154664350, 5096346969372, 10323359668079]

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

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