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 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 84 |
| 5 | 592 |
| 6 | 4659 |
| 7 | 39699 |
| 8 | 359004 |
| 9 | 3399164 |
| 10 | 33378417 |
| 11 | 337584612 |
| 12 | 3498553682 |
| 13 | 37006524557 |
| 14 | 398312230440 |
| 15 | 4351822041763 |
| 16 | 48169486233388 |
| 17 | 539303075161814 |
| 18 | 6099303431601708 |
| 19 | 69604032964928589 |
| 20 | 800737747350839332 |
| 21 | 9279033826462097649 |
| 22 | 108236883894562489628 |