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 | 3 |
| 2 | 6 |
| 3 | 11 |
| 4 | 21 |
| 5 | 45 |
| 6 | 113 |
| 7 | 339 |
| 8 | 1221 |
| 9 | 5273 |
| 10 | 27237 |
| 11 | 167985 |
| 12 | 1235820 |
| 13 | 10838397 |
| 14 | 113281002 |
| 15 | 1410702627 |
| 16 | 20928310905 |
| 17 | 369834091857 |
| 18 | 7784253038081 |
| 19 | 195135698311989 |
| 20 | 5825657474768916 |
| 21 | 207120610510791805 |
| 22 | 8769156584345509398 |
| 23 | 442116458092151729925 |
| 24 | 26542966216935028587896 |