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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.

A076906 Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant and ending in the (+,+) quadrant if n even, in the (+,-) quadrant if n odd.

Table of values

n a(n)
0 0
1 1
2 2
3 5
4 12
5 31
6 82
7 218
8 612
9 1673
10 4892
11 13672
12 41192
13 117194
14 361302
15 1042970
16 3274712
17 9567393
18 30490688
19 89984282
20 290353456

List of values

[0, 1, 2, 5, 12, 31, 82, 218, 612, 1673, 4892, 13672, 41192, 117194, 361302, 1042970, 3274712, 9567393, 30490688, 89984282, 290353456]

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

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