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 | 29 |
| 4 | 190 |
| 5 | 1562 |
| 6 | 15457 |
| 7 | 179034 |
| 8 | 2377092 |
| 9 | 35599701 |
| 10 | 593731310 |
| 11 | 10914169312 |
| 12 | 219252994039 |
| 13 | 4779086510108 |
| 14 | 112341582757512 |
| 15 | 2833025331800643 |
| 16 | 76293601822430388 |
| 17 | 2185288262904326236 |
| 18 | 66338823231846583471 |