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 | 13 |
| 2 | 91 |
| 3 | 455 |
| 4 | 1820 |
| 5 | 6188 |
| 6 | 18564 |
| 7 | 49596 |
| 8 | 119139 |
| 9 | 260743 |
| 10 | 527065 |
| 11 | 996205 |
| 12 | 1778966 |
| 13 | 3027038 |
| 14 | 4942106 |
| 15 | 7785882 |
| 16 | 11891061 |
| 17 | 17673201 |
| 18 | 25643527 |
| 19 | 36422659 |
| 20 | 50755264 |
| 21 | 69525632 |
| 22 | 93774176 |
| 23 | 124714856 |
| 24 | 163753527 |
| 25 | 212507211 |
| 26 | 272824293 |
| 27 | 346805641 |
| 28 | 436826650 |