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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.

A303330 a(n) is the number of noncrossing path sets on 3*n nodes up to rotation and reflection with each path having exactly 3 nodes.

Table of values

n a(n)
0 1
1 1
2 4
3 22
4 201
5 2244
6 29096
7 404064
8 5915838
9 89918914
10 1408072452
11 22585364697
12 369552118682
13 6148989874890
14 103788529623864
15 1773645405777098
16 30638842342771863
17 534324445644633987
18 9397210553851138484
19 166518651072771792918
20 2970743502941350443069

List of values

[1, 1, 4, 22, 201, 2244, 29096, 404064, 5915838, 89918914, 1408072452, 22585364697, 369552118682, 6148989874890, 103788529623864, 1773645405777098, 30638842342771863, 534324445644633987, 9397210553851138484, 166518651072771792918, 2970743502941350443069]

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

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