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.

A180778 Number of distinct solutions of sum{i=1..7}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.

Table of values

n a(n)
1 0
2 0
3 9
4 198
5 2294
6 19467
7 126864
8 674922
9 2997717
10 11615754
11 39660995
12 123162204
13 348412638
14 920581314
15 2264397902
16 5294830516
17 11692554408
18 24858751383
19 50403391227
20 99282023930
21 187902783369
22 347689331443
23 621482071507

List of values

[0, 0, 9, 198, 2294, 19467, 126864, 674922, 2997717, 11615754, 39660995, 123162204, 348412638, 920581314, 2264397902, 5294830516, 11692554408, 24858751383, 50403391227, 99282023930, 187902783369, 347689331443, 621482071507]

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

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