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 | 9 |
| 2 | 81 |
| 3 | 166 |
| 4 | 438 |
| 5 | 1042 |
| 6 | 1992 |
| 7 | 4168 |
| 8 | 8174 |
| 9 | 15881 |
| 10 | 30801 |
| 11 | 58335 |
| 12 | 111083 |
| 13 | 209072 |
| 14 | 391336 |
| 15 | 731541 |
| 16 | 1358864 |
| 17 | 2519079 |
| 18 | 4655423 |
| 19 | 8579122 |
| 20 | 15779179 |
| 21 | 28954160 |
| 22 | 53037211 |
| 23 | 96982948 |
| 24 | 177063128 |
| 25 | 322816525 |
| 26 | 587759306 |
| 27 | 1068885187 |
| 28 | 1941639552 |
| 29 | 3523372673 |