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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.

A337900 The number of walks of length 2n on the square lattice that start from the origin (0,0) and end at the vertex (2,0).

Table of values

n a(n)
1 1
2 16
3 225
4 3136
5 44100
6 627264
7 9018009
8 130873600
9 1914762564
10 28210561600
11 418151049316
12 6230734868736
13 93271169290000
14 1401915345465600
15 21147754404155625
16 320042195924198400
17 4857445984927644900
18 73916947787011560000
19 1127482124965160372100

List of values

[1, 16, 225, 3136, 44100, 627264, 9018009, 130873600, 1914762564, 28210561600, 418151049316, 6230734868736, 93271169290000, 1401915345465600, 21147754404155625, 320042195924198400, 4857445984927644900, 73916947787011560000, 1127482124965160372100]

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

Content is available under The OEIS End-User License Agreement.