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.

A199524 Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.

Table of values

n a(n)
1 1
2 4
3 18
4 72
5 320
6 1414
7 6346
8 28766
9 131246
10 602390
11 2777638
12 12857572
13 59712940
14 278096674
15 1298309782
16 6074112952
17 28470828008
18 133671581490
19 628526085270
20 2959291856816
21 13950087683416
22 65832860408434
23 310987879638926

List of values

[1, 4, 18, 72, 320, 1414, 6346, 28766, 131246, 602390, 2777638, 12857572, 59712940, 278096674, 1298309782, 6074112952, 28470828008, 133671581490, 628526085270, 2959291856816, 13950087683416, 65832860408434, 310987879638926]

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

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