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 | 217 |
| 4 | 611 |
| 5 | 1910 |
| 6 | 5132 |
| 7 | 13067 |
| 8 | 33937 |
| 9 | 86899 |
| 10 | 218763 |
| 11 | 551672 |
| 12 | 1390836 |
| 13 | 3491934 |
| 14 | 8760137 |
| 15 | 21976254 |
| 16 | 55062713 |
| 17 | 137841712 |
| 18 | 344913621 |
| 19 | 862466304 |
| 20 | 2155128256 |
| 21 | 5382374565 |
| 22 | 13435295369 |
| 23 | 33519373349 |
| 24 | 83589288631 |
| 25 | 208367881512 |