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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.

A168448 G.f. satisfies: A(x/A(x)^2) = C(x) where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).

Table of values

n a(n)
0 1
1 1
2 4
3 26
4 226
5 2395
6 29278
7 398499
8 5899534
9 93507783
10 1569405110
11 27672405800
12 509622262860
13 9759305238932
14 193673399146066
15 3972141366536794
16 84010899306559470
17 1829057795368804875
18 40931310532585505770
19 940322157062673670051
20 22152626055397162566438

List of values

[1, 1, 4, 26, 226, 2395, 29278, 398499, 5899534, 93507783, 1569405110, 27672405800, 509622262860, 9759305238932, 193673399146066, 3972141366536794, 84010899306559470, 1829057795368804875, 40931310532585505770, 940322157062673670051, 22152626055397162566438]

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

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