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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.

A199848 Number of -n..n arrays x(0..3) of 4 elements with zero sum and no element more than one greater than the previous.

Table of values

n a(n)
1 11
2 23
3 42
4 68
5 103
6 149
7 206
8 276
9 361
10 461
11 578
12 714
13 869
14 1045
15 1244
16 1466
17 1713
18 1987
19 2288
20 2618
21 2979
22 3371
23 3796
24 4256
25 4751
26 5283
27 5854
28 6464
29 7115
30 7809
31 8546
32 9328
33 10157
34 11033
35 11958
36 12934
37 13961
38 15041
39 16176
40 17366
41 18613
42 19919
43 21284

List of values

[11, 23, 42, 68, 103, 149, 206, 276, 361, 461, 578, 714, 869, 1045, 1244, 1466, 1713, 1987, 2288, 2618, 2979, 3371, 3796, 4256, 4751, 5283, 5854, 6464, 7115, 7809, 8546, 9328, 10157, 11033, 11958, 12934, 13961, 15041, 16176, 17366, 18613, 19919, 21284]

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

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