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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.

A083692 Length of list generated by n replacements of k by {-1-|k|, .., 1+|k|} with increment 2, starting with {1}.

Table of values

n a(n)
0 1
1 3
2 10
3 38
4 148
5 620
6 2600
7 11480
8 50256
9 229296
10 1032352
11 4816736
12 22118720
13 104890048
14 488768128
15 2346515840
16 11058545920
17 53605825280
18 254908828160
19 1245304583680
20 5965139153920
21 29328419056640
22 141339991746560

List of values

[1, 3, 10, 38, 148, 620, 2600, 11480, 50256, 229296, 1032352, 4816736, 22118720, 104890048, 488768128, 2346515840, 11058545920, 53605825280, 254908828160, 1245304583680, 5965139153920, 29328419056640, 141339991746560]

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

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