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 | 10 |
| 2 | 1 |
| 3 | 131 |
| 4 | 474 |
| 5 | 10233 |
| 6 | 50844 |
| 7 | 1001250 |
| 8 | 5225775 |
| 9 | 99980565 |
| 10 | 536333508 |
| 11 | 9998984322 |
| 12 | 55188464010 |
| 13 | 999994914558 |
| 14 | 5683515922236 |
| 15 | 100001648752524 |
| 16 | 585428890525092 |
| 17 | 10000105972653645 |
| 18 | 60302140270087340 |
| 19 | 1000004027662440330 |
| 20 | 6207976859006478708 |
| 21 | 100000111315410065850 |