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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.

A001003 Schroeder's second problem (generalized parentheses); also called super-Catalan numbers or little Schroeder numbers.

Table of values

n a(n)
0 1
1 1
2 3
3 11
4 45
5 197
6 903
7 4279
8 20793
9 103049
10 518859
11 2646723
12 13648869
13 71039373
14 372693519
15 1968801519
16 10463578353
17 55909013009
18 300159426963
19 1618362158587
20 8759309660445
21 47574827600981
22 259215937709463
23 1416461675464871

List of values

[1, 1, 3, 11, 45, 197, 903, 4279, 20793, 103049, 518859, 2646723, 13648869, 71039373, 372693519, 1968801519, 10463578353, 55909013009, 300159426963, 1618362158587, 8759309660445, 47574827600981, 259215937709463, 1416461675464871]

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

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