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 | 7 |
| 2 | 56 |
| 3 | 273 |
| 4 | 1463 |
| 5 | 6048 |
| 6 | 26537 |
| 7 | 97903 |
| 8 | 377384 |
| 9 | 1281497 |
| 10 | 4502463 |
| 11 | 14322560 |
| 12 | 46849089 |
| 13 | 141332583 |
| 14 | 436556440 |
| 15 | 1259742225 |
| 16 | 3710541975 |
| 17 | 10308494560 |
| 18 | 29165172617 |
| 19 | 78396244591 |
| 20 | 214217633672 |
| 21 | 559335671353 |
| 22 | 1482519853311 |
| 23 | 3772127020032 |
| 24 | 9731443674113 |
| 25 | 24191903115079 |
| 26 | 60918829766648 |