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.

A200186 Number of -2..2 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.

Table of values

n a(n)
1 1
2 4
3 6
4 14
5 24
6 54
7 104
8 230
9 464
10 1028
11 2128
12 4720
13 9918
14 22038
15 46760
16 104056
17 222338
18 495358
19 1064138
20 2373070
21 5119796
22 11425974
23 24738074
24 55242788
25 119958510
26 268018844
27 583462384
28 1304179214
29 2845288284
30 6362293924

List of values

[1, 4, 6, 14, 24, 54, 104, 230, 464, 1028, 2128, 4720, 9918, 22038, 46760, 104056, 222338, 495358, 1064138, 2373070, 5119796, 11425974, 24738074, 55242788, 119958510, 268018844, 583462384, 1304179214, 2845288284, 6362293924]

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

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