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 | 9 |
| 2 | 81 |
| 3 | 270 |
| 4 | 872 |
| 5 | 1915 |
| 6 | 4266 |
| 7 | 7879 |
| 8 | 14632 |
| 9 | 24440 |
| 10 | 40816 |
| 11 | 63714 |
| 12 | 99260 |
| 13 | 147469 |
| 14 | 218666 |
| 15 | 312723 |
| 16 | 446708 |
| 17 | 619670 |
| 18 | 859376 |
| 19 | 1162558 |
| 20 | 1573616 |
| 21 | 2084223 |
| 22 | 2764010 |
| 23 | 3595063 |
| 24 | 4684320 |
| 25 | 5997316 |
| 26 | 7694800 |
| 27 | 9715586 |
| 28 | 12296260 |
| 29 | 15334641 |
| 30 | 19171946 |
| 31 | 23645587 |