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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.

A253487 Number of lattice paths of 2*n+2 steps in the first quadrant from (0,0) to (n,n).

Table of values

n a(n)
0 2
1 16
2 90
3 448
4 2100
5 9504
6 42042
7 183040
8 787644
9 3359200
10 14226212
11 59907456
12 251100200
13 1048380480
14 4362680250
15 18103127040
16 74934688620
17 309509877600
18 1275964023180
19 5251296336000
20 21579247511640
21 88555121603520
22 362957071241700
23 1485969577717248

List of values

[2, 16, 90, 448, 2100, 9504, 42042, 183040, 787644, 3359200, 14226212, 59907456, 251100200, 1048380480, 4362680250, 18103127040, 74934688620, 309509877600, 1275964023180, 5251296336000, 21579247511640, 88555121603520, 362957071241700, 1485969577717248]

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

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