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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.

A339565 Number of lattice paths from (0,0) to (n,n) using steps (0,1), (1,0), (1,1), (1,2), (2,1).

Table of values

n a(n)
0 1
1 3
2 17
3 101
4 627
5 3999
6 25955
7 170571
8 1131433
9 7559301
10 50795985
11 342935689
12 2324278669
13 15804931797
14 107775401349
15 736723618773
16 5046774983235
17 34636814325087
18 238114193665451
19 1639378334244867
20 11301978856210543
21 78010917772099207
22 539055832175992119

List of values

[1, 3, 17, 101, 627, 3999, 25955, 170571, 1131433, 7559301, 50795985, 342935689, 2324278669, 15804931797, 107775401349, 736723618773, 5046774983235, 34636814325087, 238114193665451, 1639378334244867, 11301978856210543, 78010917772099207, 539055832175992119]

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

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