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 | 3 |
| 3 | 11 |
| 4 | 21 |
| 5 | 39 |
| 6 | 76 |
| 7 | 248 |
| 8 | 844 |
| 9 | 1520 |
| 10 | 2752 |
| 11 | 9317 |
| 12 | 17223 |
| 13 | 31221 |
| 14 | 57071 |
| 15 | 99741 |
| 16 | 589932 |
| 17 | 58056875 |
| 18 | 101769229 |
| 19 | 302890748 |
| 20 | 511561220 |
| 21 | 904036924 |
| 22 | 39488697700 |
| 23 | 325374626148 |
| 24 | 535755688021 |
| 25 | 1404720439053 |
| 26 | 3883018238329 |
| 27 | 6283167591179 |
| 28 | 16166305650060 |
| 29 | 25735985498861 |
| 30 | 40806937801472 |