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 | 5 |
| 2 | 22 |
| 3 | 95 |
| 4 | 409 |
| 5 | 1760 |
| 6 | 7573 |
| 7 | 32585 |
| 8 | 140206 |
| 9 | 603275 |
| 10 | 2595757 |
| 11 | 11168960 |
| 12 | 48057529 |
| 13 | 206780765 |
| 14 | 889731238 |
| 15 | 3828313895 |
| 16 | 16472375761 |
| 17 | 70876937120 |
| 18 | 304967558317 |
| 19 | 1312206980225 |
| 20 | 5646132226174 |
| 21 | 24294040190195 |
| 22 | 104531804272453 |