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 | 9 |
| 3 | 38 |
| 4 | 120 |
| 5 | 327 |
| 6 | 819 |
| 7 | 1948 |
| 8 | 4482 |
| 9 | 10085 |
| 10 | 22341 |
| 11 | 48930 |
| 12 | 106236 |
| 13 | 229075 |
| 14 | 491175 |
| 15 | 1048184 |
| 16 | 2227782 |
| 17 | 4718097 |
| 18 | 9960921 |
| 19 | 20970910 |
| 20 | 44039520 |
| 21 | 92273951 |
| 22 | 192937179 |
| 23 | 402652308 |
| 24 | 838859850 |
| 25 | 1744829437 |
| 26 | 3623877549 |
| 27 | 7516191578 |
| 28 | 15569255172 |
| 29 | 32212253355 |
| 30 | 66571991631 |