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.
n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 3 |
4 | 7 |
5 | 31 |
6 | 181 |
7 | 1009 |
8 | 13441 |
9 | 45361 |
10 | 453601 |
11 | 3991681 |
12 | 39916801 |
13 | 566092801 |
14 | 10897286401 |
15 | 130767436801 |
16 | 2988969984001 |
17 | 25406244864001 |
18 | 0 |
19 | 8109673360588801 |
20 | 304112751022080001 |
21 | 2688996956405760001 |