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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.

A080938 Number of Catalan paths (nonnegative, starting and ending at 0, step +-1) of 2*n steps with all values less than or equal to 7.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 14
5 42
6 132
7 429
8 1429
9 4846
10 16645
11 57686
12 201158
13 704420
14 2473785
15 8704089
16 30664890
17 108126325
18 381478030
19 1346396146
20 4753200932
21 16783118309
22 59266297613
23 209302921830
24 739203970773
25 2610763825782
26 9221050139566
27 32568630376132

List of values

[1, 1, 2, 5, 14, 42, 132, 429, 1429, 4846, 16645, 57686, 201158, 704420, 2473785, 8704089, 30664890, 108126325, 381478030, 1346396146, 4753200932, 16783118309, 59266297613, 209302921830, 739203970773, 2610763825782, 9221050139566, 32568630376132]

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

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