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 | 2 |
| 2 | 6 |
| 3 | 44 |
| 4 | 345 |
| 5 | 4182 |
| 6 | 53571 |
| 7 | 905144 |
| 8 | 16154550 |
| 9 | 349976610 |
| 10 | 8015743483 |
| 11 | 211987872516 |
| 12 | 5925745900685 |
| 13 | 185188128471374 |
| 14 | 6108604964499810 |
| 15 | 220403394009702384 |
| 16 | 8375181440031684305 |
| 17 | 342816825221831030490 |