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 | 4 |
| 3 | 29 |
| 4 | 384 |
| 5 | 8009 |
| 6 | 222272 |
| 7 | 8007621 |
| 8 | 368537600 |
| 9 | 20666061201 |
| 10 | 1382898312192 |
| 11 | 109329652877037 |
| 12 | 10019611878850560 |
| 13 | 1051350493309688025 |
| 14 | 125329539339246256128 |
| 15 | 16802547359327516681109 |
| 16 | 2513955132693623215226880 |
| 17 | 417301267683794684221354785 |