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 | 28 |
| 3 | 157 |
| 4 | 1248 |
| 5 | 4650 |
| 6 | 15162 |
| 7 | 37988 |
| 8 | 86958 |
| 9 | 181423 |
| 10 | 351708 |
| 11 | 648441 |
| 12 | 1127392 |
| 13 | 1874194 |
| 14 | 2988466 |
| 15 | 4602096 |
| 16 | 6870240 |
| 17 | 9983347 |
| 18 | 14163972 |
| 19 | 19672403 |
| 20 | 26812260 |
| 21 | 35929480 |
| 22 | 47418482 |
| 23 | 61723238 |
| 24 | 79341720 |
| 25 | 100828175 |
| 26 | 126796852 |
| 27 | 157924785 |