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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 33 |
| 5 | 80 |
| 6 | 174 |
| 7 | 588 |
| 8 | 1596 |
| 9 | 3135 |
| 10 | 9950 |
| 11 | 28512 |
| 12 | 56268 |
| 13 | 196040 |
| 14 | 496496 |
| 15 | 888300 |
| 16 | 3524577 |
| 17 | 9224880 |
| 18 | 18118362 |
| 19 | 63239220 |
| 20 | 150527400 |
| 21 | 310190454 |
| 22 | 1129200138 |
| 23 | 2971168704 |
| 24 | 5834056536 |
| 25 | 18513646430 |
| 26 | 53213956640 |
| 27 | 104687896833 |