cp's OEIS Frontend

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.

A005315 Closed meandric numbers (or meanders): number of ways a loop can cross a road 2n times.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 42
5 262
6 1828
7 13820
8 110954
9 933458
10 8152860
11 73424650
12 678390116
13 6405031050
14 61606881612
15 602188541928
16 5969806669034
17 59923200729046
18 608188709574124
19 6234277838531806
20 64477712119584604
21 672265814872772972
22 7060941974458061392

List of values

[1, 1, 2, 8, 42, 262, 1828, 13820, 110954, 933458, 8152860, 73424650, 678390116, 6405031050, 61606881612, 602188541928, 5969806669034, 59923200729046, 608188709574124, 6234277838531806, 64477712119584604, 672265814872772972, 7060941974458061392]

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

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