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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 8 |
| 7 | 30 |
| 8 | 94 |
| 9 | 257 |
| 10 | 640 |
| 11 | 1505 |
| 12 | 3482 |
| 13 | 8402 |
| 14 | 22660 |
| 15 | 70825 |
| 16 | 248912 |
| 17 | 924764 |
| 18 | 3465758 |
| 19 | 12813670 |
| 20 | 46470377 |
| 21 | 165908866 |
| 22 | 588617326 |
| 23 | 2103688426 |
| 24 | 7696710691 |
| 25 | 29266242303 |
| 26 | 116732304039 |
| 27 | 488414436671 |
| 28 | 2126002398180 |
| 29 | 9511898145938 |
| 30 | 43251315994457 |