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 | 9 |
| 4 | 26 |
| 5 | 73 |
| 6 | 201 |
| 7 | 546 |
| 8 | 1469 |
| 9 | 3925 |
| 10 | 10434 |
| 11 | 27633 |
| 12 | 72977 |
| 13 | 192322 |
| 14 | 506037 |
| 15 | 1329885 |
| 16 | 3491810 |
| 17 | 9161929 |
| 18 | 24026745 |
| 19 | 62983842 |
| 20 | 165055853 |
| 21 | 432445861 |
| 22 | 1132806018 |
| 23 | 2967020769 |
| 24 | 7770353441 |
| 25 | 20348233858 |
| 26 | 53282736741 |
| 27 | 139516753581 |
| 28 | 365301078434 |
| 29 | 956453590585 |