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.

A199842 Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.

Table of values

n a(n)
1 1
2 4
3 13
4 42
5 132
6 428
7 1393
8 4561
9 15032
10 49889
11 166542
12 558744
13 1883028
14 6370957
15 21628455
16 73641852
17 251385571
18 860067894
19 2948380732
20 10124956970
21 34823894885
22 119940097035
23 413612099138
24 1427945022753
25 4934850614704

List of values

[1, 4, 13, 42, 132, 428, 1393, 4561, 15032, 49889, 166542, 558744, 1883028, 6370957, 21628455, 73641852, 251385571, 860067894, 2948380732, 10124956970, 34823894885, 119940097035, 413612099138, 1427945022753, 4934850614704]

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

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