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.

A199828 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.

Table of values

n a(n)
1 44
2 336
3 2146
4 15708
5 118280
6 888420
7 6715618
8 51077518
9 390278378
10 2993722414
11 23038998514
12 177794832922
13 1375379617514
14 10662124449466
15 82808224932874
16 644200988262616
17 5018935818153796
18 39154328577073846
19 305823285072243150

List of values

[44, 336, 2146, 15708, 118280, 888420, 6715618, 51077518, 390278378, 2993722414, 23038998514, 177794832922, 1375379617514, 10662124449466, 82808224932874, 644200988262616, 5018935818153796, 39154328577073846, 305823285072243150]

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

Content is available under The OEIS End-User License Agreement.