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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.

A077551 Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant, crossing x axis first and ending in any quadrant.

Table of values

n a(n)
0 0
1 1
2 3
3 5
4 16
5 31
6 105
7 218
8 770
9 1673
10 6096
11 13672
12 51027
13 117194
14 445787
15 1042970
16 4028922
17 9567393
18 37432324
19 89984282
20 355854272

List of values

[0, 1, 3, 5, 16, 31, 105, 218, 770, 1673, 6096, 13672, 51027, 117194, 445787, 1042970, 4028922, 9567393, 37432324, 89984282, 355854272]

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

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