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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 22 |
| 3 | 210 |
| 4 | 4426 |
| 5 | 102330 |
| 6 | 2906362 |
| 7 | 95952570 |
| 8 | 3622138906 |
| 9 | 153816150810 |
| 10 | 7257695358202 |
| 11 | 376693381614330 |
| 12 | 21328770664314586 |
| 13 | 1308295248437904090 |
| 14 | 86423208789970618042 |
| 15 | 6116714829331037666490 |
| 16 | 461779664078480243085466 |
| 17 | 37040796099362864616022170 |