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 | 5 |
| 2 | 40 |
| 3 | 236 |
| 4 | 1519 |
| 5 | 10475 |
| 6 | 54280 |
| 7 | 441284 |
| 8 | 2187360 |
| 9 | 17694245 |
| 10 | 103595049 |
| 11 | 673741196 |
| 12 | 4610651760 |
| 13 | 24155269835 |
| 14 | 194708863431 |
| 15 | 956722571075 |
| 16 | 7826203465920 |
| 17 | 45467666569916 |
| 18 | 298790677846089 |
| 19 | 2029162683616205 |
| 20 | 10747406201475600 |
| 21 | 85901867185267604 |
| 22 | 418375017592176440 |