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 | 21 |
| 2 | 230 |
| 3 | 1750 |
| 4 | 10394 |
| 5 | 51338 |
| 6 | 219373 |
| 7 | 833129 |
| 8 | 2867249 |
| 9 | 9073845 |
| 10 | 26706681 |
| 11 | 73769301 |
| 12 | 192639951 |
| 13 | 478480891 |
| 14 | 1136148412 |
| 15 | 2590157556 |
| 16 | 5690334091 |
| 17 | 12085148911 |
| 18 | 24881271591 |
| 19 | 49780020675 |
| 20 | 96990931345 |
| 21 | 184385864445 |
| 22 | 342595978935 |
| 23 | 623097898035 |
| 24 | 1110823234484 |
| 25 | 1943507590140 |