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 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 41 |
| 6 | 102 |
| 7 | 248 |
| 8 | 592 |
| 9 | 1392 |
| 10 | 3232 |
| 11 | 7424 |
| 12 | 16896 |
| 13 | 38144 |
| 14 | 85504 |
| 15 | 190464 |
| 16 | 421888 |
| 17 | 929792 |
| 18 | 2039808 |
| 19 | 4456448 |
| 20 | 9699328 |
| 21 | 21037056 |
| 22 | 45481984 |
| 23 | 98041856 |
| 24 | 210763776 |
| 25 | 451936256 |
| 26 | 966787072 |
| 27 | 2063597568 |
| 28 | 4395630592 |
| 29 | 9344909312 |
| 30 | 19830669312 |