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 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 102 |
| 8 | 231 |
| 9 | 524 |
| 10 | 1189 |
| 11 | 2699 |
| 12 | 6127 |
| 13 | 13910 |
| 14 | 31581 |
| 15 | 71702 |
| 16 | 162796 |
| 17 | 369622 |
| 18 | 839216 |
| 19 | 1905419 |
| 20 | 4326211 |
| 21 | 9822571 |
| 22 | 22301948 |
| 23 | 50636130 |
| 24 | 114968339 |
| 25 | 261033373 |
| 26 | 592671205 |
| 27 | 1345648489 |
| 28 | 3055268857 |
| 29 | 6936928864 |
| 30 | 15750162908 |