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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 31 |
| 6 | 112 |
| 7 | 467 |
| 8 | 2141 |
| 9 | 10739 |
| 10 | 58454 |
| 11 | 340389 |
| 12 | 2110093 |
| 13 | 13830234 |
| 14 | 95475087 |
| 15 | 691543059 |
| 16 | 5240282987 |
| 17 | 41432986587 |
| 18 | 341040306207 |
| 19 | 2916376237349 |
| 20 | 25862097428262 |
| 21 | 237434959190586 |
| 22 | 2253358056942644 |
| 23 | 22076003468637449 |
| 24 | 222979436688500085 |
| 25 | 2319295172178428701 |