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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.

A337168 a(n) = (-1)^n + 2 * Sum_{k=0..n-1} a(k) * a(n-k-1).

Table of values

n a(n)
0 1
1 1
2 5
3 21
4 105
5 553
6 3053
7 17405
8 101713
9 606033
10 3667797
11 22485477
12 139340985
13 871429497
14 5492959293
15 34862161869
16 222592918689
17 1428814897825
18 9215016141989
19 59684122637237
20 388045493943049
21 2531696701375689
22 16569559364596365
23 108758426952823709

List of values

[1, 1, 5, 21, 105, 553, 3053, 17405, 101713, 606033, 3667797, 22485477, 139340985, 871429497, 5492959293, 34862161869, 222592918689, 1428814897825, 9215016141989, 59684122637237, 388045493943049, 2531696701375689, 16569559364596365, 108758426952823709]

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

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