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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.

A383479 Number of lattice paths from (0,0) to (n,n) using steps (1,0),(3,0),(0,1).

Table of values

n a(n)
0 1
1 2
2 6
3 24
4 100
5 420
6 1792
7 7752
8 33858
9 148940
10 658944
11 2929056
12 13070876
13 58521344
14 262754040
15 1182619280
16 5334172518
17 24104916504
18 109111142376
19 494630028200
20 2245300152480
21 10204575481320
22 46429481139000
23 211460450151600
24 963971663881200
25 4398118872144192

List of values

[1, 2, 6, 24, 100, 420, 1792, 7752, 33858, 148940, 658944, 2929056, 13070876, 58521344, 262754040, 1182619280, 5334172518, 24104916504, 109111142376, 494630028200, 2245300152480, 10204575481320, 46429481139000, 211460450151600, 963971663881200, 4398118872144192]

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

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