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 | 3 |
| 2 | 4 |
| 3 | 7 |
| 4 | 11 |
| 5 | 95 |
| 6 | 106 |
| 7 | 201 |
| 8 | 307 |
| 9 | 1122 |
| 10 | 20503 |
| 11 | 62631 |
| 12 | 83134 |
| 13 | 145765 |
| 14 | 228899 |
| 15 | 1976957 |
| 16 | 2205856 |
| 17 | 4182813 |
| 18 | 6388669 |
| 19 | 23348820 |
| 20 | 426667429 |
| 21 | 1303351107 |
| 22 | 1730018536 |
| 23 | 3033369643 |
| 24 | 4763388179 |
| 25 | 41140475075 |
| 26 | 45903863254 |
| 27 | 87044338329 |
| 28 | 132948201583 |
| 29 | 485888943078 |