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 | 5 |
| 2 | 25 |
| 3 | 90 |
| 4 | 247 |
| 5 | 766 |
| 6 | 2258 |
| 7 | 5860 |
| 8 | 16526 |
| 9 | 45639 |
| 10 | 124043 |
| 11 | 313327 |
| 12 | 837221 |
| 13 | 2216256 |
| 14 | 5545541 |
| 15 | 14524810 |
| 16 | 37810204 |
| 17 | 97907017 |
| 18 | 242993558 |
| 19 | 625252309 |
| 20 | 1602714963 |
| 21 | 3962518559 |
| 22 | 10109705767 |
| 23 | 25718726896 |
| 24 | 63402237401 |
| 25 | 160711911464 |