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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.

A187357 Catalan trisection: A000108(3*n), n >= 0.

Table of values

n a(n)
0 1
1 5
2 132
3 4862
4 208012
5 9694845
6 477638700
7 24466267020
8 1289904147324
9 69533550916004
10 3814986502092304
11 212336130412243110
12 11959798385860453492
13 680425371729975800390
14 39044429911904443959240
15 2257117854077248073253720
16 131327898242169365477991900
17 7684785670514316385230816156
18 451959718027953471447609509424

List of values

[1, 5, 132, 4862, 208012, 9694845, 477638700, 24466267020, 1289904147324, 69533550916004, 3814986502092304, 212336130412243110, 11959798385860453492, 680425371729975800390, 39044429911904443959240, 2257117854077248073253720, 131327898242169365477991900, 7684785670514316385230816156, 451959718027953471447609509424]

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

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