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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.

A187359 Catalan trisection: A000108(3*n + 2)/2, n>=0.

Table of values

n a(n)
0 1
1 21
2 715
3 29393
4 1337220
5 64822395
6 3282060210
7 171529806825
8 9183676536076
9 501121108325684
10 27767032438524099
11 1558142747453650631
12 88366931393503350700
13 5056959295818949067010
14 291650059796498346544020
15 16934386878595523443214745
16 989130828878080326811887228
17 58078935727891217125276922940
18 3426228463922436748774829232156
19 202972497563788492865321721683556

List of values

[1, 21, 715, 29393, 1337220, 64822395, 3282060210, 171529806825, 9183676536076, 501121108325684, 27767032438524099, 1558142747453650631, 88366931393503350700, 5056959295818949067010, 291650059796498346544020, 16934386878595523443214745, 989130828878080326811887228, 58078935727891217125276922940, 3426228463922436748774829232156, 202972497563788492865321721683556]

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

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