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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.

A337901 The number of walks of length 2n+1 on the square lattice that start from the origin (0,0) and end at the vertex (3,0).

Table of values

n a(n)
1 1
2 25
3 441
4 7056
5 108900
6 1656369
7 25050025
8 378224704
9 5712638724
10 86394844900
11 1308887012356
12 19868414760000
13 302198588499600
14 4605510959127225
15 70321771565375625
16 1075697380745222400
17 16483023079048102500
18 252980753801047064100
19 3888662839165553120100

List of values

[1, 25, 441, 7056, 108900, 1656369, 25050025, 378224704, 5712638724, 86394844900, 1308887012356, 19868414760000, 302198588499600, 4605510959127225, 70321771565375625, 1075697380745222400, 16483023079048102500, 252980753801047064100, 3888662839165553120100]

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

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