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 | 2 |
| 3 | 8 |
| 4 | 31 |
| 5 | 147 |
| 6 | 899 |
| 7 | 5777 |
| 8 | 41024 |
| 9 | 322488 |
| 10 | 2749325 |
| 11 | 25118777 |
| 12 | 245389896 |
| 13 | 2554780438 |
| 14 | 28009868787 |
| 15 | 323746545433 |
| 16 | 3933023224691 |
| 17 | 49924332801387 |
| 18 | 661988844566017 |
| 19 | 9138403573970063 |
| 20 | 131043199040556235 |
| 21 | 1949750421507432009 |
| 22 | 30031656711776544610 |