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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.

A200000 Number of meanders filling out an n X n grid, reduced for symmetry.

Table of values

n a(n)
1 1
2 1
3 0
4 4
5 42
6 9050
7 6965359
8 26721852461
9 429651752290375
10 31194475941824888769
11 9828395457980805457337560
12 13684686862375136981850903785368
13 83297108604256429529069019958551956425
14 2226741508593975401942934273354241209226704830
15 260577257822688861848154672171293101310412373160498171
16 133631198381015786582155688877301469836628906260462969996612568
17 299985729493560746632648983353916422875677601725131683097521792924081609

List of values

[1, 1, 0, 4, 42, 9050, 6965359, 26721852461, 429651752290375, 31194475941824888769, 9828395457980805457337560, 13684686862375136981850903785368, 83297108604256429529069019958551956425, 2226741508593975401942934273354241209226704830, 260577257822688861848154672171293101310412373160498171, 133631198381015786582155688877301469836628906260462969996612568, 299985729493560746632648983353916422875677601725131683097521792924081609]

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

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