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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.

A003047 a(n) = Catalan(n) * Product_{k = 0..n-1} a(k).

Table of values

n a(n)
1 1
2 1
3 2
4 10
5 280
6 235200
7 173859840000
8 98238542885683200000000
9 32169371027674057560745102540800000000000000000
10 3518552669874927170883258602839130084576857453953842493259776000000000000000000000000000000000

List of values

[1, 1, 2, 10, 280, 235200, 173859840000, 98238542885683200000000, 32169371027674057560745102540800000000000000000, 3518552669874927170883258602839130084576857453953842493259776000000000000000000000000000000000]

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

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