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 | 45 |
| 3 | 278 |
| 4 | 1677 |
| 5 | 14691 |
| 6 | 112235 |
| 7 | 850404 |
| 8 | 6660799 |
| 9 | 51754039 |
| 10 | 401363520 |
| 11 | 3119306759 |
| 12 | 24239641260 |
| 13 | 188341349284 |
| 14 | 1463488096858 |
| 15 | 11372085577974 |
| 16 | 88367785063892 |
| 17 | 686667612240495 |
| 18 | 5335806199766372 |
| 19 | 41462375276685856 |
| 20 | 322187049424431729 |