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 | 8 |
| 5 | 18 |
| 6 | 46 |
| 7 | 108 |
| 8 | 280 |
| 9 | 694 |
| 10 | 1788 |
| 11 | 4544 |
| 12 | 11740 |
| 13 | 30105 |
| 14 | 77584 |
| 15 | 199102 |
| 16 | 510910 |
| 17 | 1305859 |
| 18 | 3328504 |
| 19 | 8441297 |
| 20 | 21293077 |
| 21 | 53315322 |
| 22 | 132301407 |
| 23 | 324539916 |
| 24 | 784969397 |
| 25 | 1866286028 |
| 26 | 4347578908 |
| 27 | 9887356006 |
| 28 | 21865065180 |
| 29 | 46806020153 |
| 30 | 96503472390 |
| 31 | 190548248699 |