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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.

A191649 Number of lattice paths from (0,0) to (n,n) using steps (0,1), (1,0), (1,1), (2,2).

Table of values

n a(n)
0 1
1 3
2 14
3 71
4 379
5 2082
6 11651
7 66051
8 378064
9 2180037
10 12644861
11 73695358
12 431209313
13 2531556197
14 14904832196
15 87970766447
16 520337606401
17 3083584244460
18 18304476242735
19 108820740004749
20 647817646760368
21 3861215365595659
22 23039691494489015
23 137615812845579390

List of values

[1, 3, 14, 71, 379, 2082, 11651, 66051, 378064, 2180037, 12644861, 73695358, 431209313, 2531556197, 14904832196, 87970766447, 520337606401, 3083584244460, 18304476242735, 108820740004749, 647817646760368, 3861215365595659, 23039691494489015, 137615812845579390]

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

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