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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.

A207851 Number of meanders of order 2n+1 (4*n+2 crossings of the infinite line) with only central 1-1 cut (no other 1-1 cuts).

Table of values

n a(n)
1 4
2 16
3 324
4 12100
5 595984
6 35236096
7 2363709924
8 174221090404
9 13815880848784
10 1161868621405636
11 102544273501721104
12 9424551852935116804
13 896612457556434503824
14 87881363502264179831824
15 8840846163309028336017124

List of values

[4, 16, 324, 12100, 595984, 35236096, 2363709924, 174221090404, 13815880848784, 1161868621405636, 102544273501721104, 9424551852935116804, 896612457556434503824, 87881363502264179831824, 8840846163309028336017124]

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

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