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 | 5 |
| 3 | 16 |
| 4 | 37 |
| 5 | 96 |
| 6 | 254 |
| 7 | 654 |
| 8 | 1709 |
| 9 | 4472 |
| 10 | 11621 |
| 11 | 30257 |
| 12 | 78899 |
| 13 | 205534 |
| 14 | 535394 |
| 15 | 1395017 |
| 16 | 3634476 |
| 17 | 9468722 |
| 18 | 24669483 |
| 19 | 64272370 |
| 20 | 167449745 |
| 21 | 436262198 |
| 22 | 1136608103 |
| 23 | 2961236309 |
| 24 | 7714995835 |
| 25 | 20100110050 |
| 26 | 52367403411 |
| 27 | 136434332477 |
| 28 | 355456392933 |