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 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 11 |
| 5 | 30 |
| 6 | 491 |
| 7 | 1012 |
| 8 | 1503 |
| 9 | 4018 |
| 10 | 5521 |
| 11 | 15060 |
| 12 | 246481 |
| 13 | 508022 |
| 14 | 754503 |
| 15 | 2017028 |
| 16 | 2771531 |
| 17 | 7560090 |
| 18 | 123732971 |
| 19 | 255026032 |
| 20 | 378759003 |
| 21 | 1012544038 |
| 22 | 1391303041 |
| 23 | 3795150120 |
| 24 | 62113704961 |
| 25 | 128022560042 |