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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 29 |
| 6 | 97 |
| 7 | 378 |
| 8 | 775 |
| 9 | 2940 |
| 10 | 11368 |
| 11 | 45671 |
| 12 | 113556 |
| 13 | 479745 |
| 14 | 1094742 |
| 15 | 3536813 |
| 16 | 15177837 |
| 17 | 67116740 |
| 18 | 300914463 |
| 19 | 519239984 |
| 20 | 3251343406 |