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 | 15 |
| 3 | 102 |
| 4 | 442 |
| 5 | 1443 |
| 6 | 3885 |
| 7 | 9100 |
| 8 | 19188 |
| 9 | 37269 |
| 10 | 67771 |
| 11 | 116754 |
| 12 | 192270 |
| 13 | 304759 |
| 14 | 467481 |
| 15 | 696984 |
| 16 | 1013608 |
| 17 | 1442025 |
| 18 | 2011815 |
| 19 | 2758078 |
| 20 | 3722082 |
| 21 | 4951947 |
| 22 | 6503365 |
| 23 | 8440356 |
| 24 | 10836060 |
| 25 | 13773565 |
| 26 | 17346771 |
| 27 | 21661290 |
| 28 | 26835382 |
| 29 | 33000927 |
| 30 | 40304433 |