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 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 31 |
| 5 | 116 |
| 6 | 379 |
| 7 | 1133 |
| 8 | 3210 |
| 9 | 8803 |
| 10 | 23701 |
| 11 | 63239 |
| 12 | 168287 |
| 13 | 447905 |
| 14 | 1194814 |
| 15 | 3196180 |
| 16 | 8576505 |
| 17 | 23081668 |
| 18 | 62292381 |
| 19 | 168536249 |
| 20 | 457035453 |
| 21 | 1241954405 |
| 22 | 3381289332 |
| 23 | 9221603416 |
| 24 | 25189382006 |
| 25 | 68906572413 |
| 26 | 188750887991 |