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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.

A005316 Meandric numbers: number of ways a river can cross a road n times.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 8
6 14
7 42
8 81
9 262
10 538
11 1828
12 3926
13 13820
14 30694
15 110954
16 252939
17 933458
18 2172830
19 8152860
20 19304190
21 73424650
22 176343390
23 678390116
24 1649008456
25 6405031050
26 15730575554
27 61606881612
28 152663683494
29 602188541928
30 1503962954930
31 5969806669034
32 15012865733351
33 59923200729046
34 151622652413194
35 608188709574124
36 1547365078534578
37 6234277838531806
38 15939972379349178
39 64477712119584604
40 165597452660771610
41 672265814872772972
42 1733609081727968492
43 7060941974458061392

List of values

[1, 1, 1, 2, 3, 8, 14, 42, 81, 262, 538, 1828, 3926, 13820, 30694, 110954, 252939, 933458, 2172830, 8152860, 19304190, 73424650, 176343390, 678390116, 1649008456, 6405031050, 15730575554, 61606881612, 152663683494, 602188541928, 1503962954930, 5969806669034, 15012865733351, 59923200729046, 151622652413194, 608188709574124, 1547365078534578, 6234277838531806, 15939972379349178, 64477712119584604, 165597452660771610, 672265814872772972, 1733609081727968492, 7060941974458061392]

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

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