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) |
|---|---|
| 3 | 57 |
| 4 | 486 |
| 5 | 4117 |
| 6 | 34760 |
| 7 | 293086 |
| 8 | 2471917 |
| 9 | 20870169 |
| 10 | 176467252 |
| 11 | 1494672812 |
| 12 | 12682766442 |
| 13 | 107814252502 |
| 14 | 918166760699 |
| 15 | 7832993240285 |
| 16 | 66936986352534 |
| 17 | 572934789920969 |
| 18 | 4911478255448828 |
| 19 | 42165255645650628 |
| 20 | 362494201554529232 |
| 21 | 3120475613849051712 |
| 22 | 26895832224848130557 |