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 | 5 |
| 3 | 18 |
| 4 | 93 |
| 5 | 650 |
| 6 | 5825 |
| 7 | 64486 |
| 8 | 858525 |
| 9 | 13460814 |
| 10 | 244360845 |
| 11 | 5063982498 |
| 12 | 118379934453 |
| 13 | 3090176655290 |
| 14 | 89294118056273 |
| 15 | 2834776197278278 |
| 16 | 98222473389128821 |
| 17 | 3693056479700344798 |
| 18 | 149906848766779722109 |