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 | 3 |
| 3 | 12 |
| 4 | 63 |
| 5 | 432 |
| 6 | 3798 |
| 7 | 41472 |
| 8 | 543483 |
| 9 | 8301312 |
| 10 | 144502218 |
| 11 | 2818685952 |
| 12 | 60826110678 |
| 13 | 1437615931392 |
| 14 | 36914181252588 |
| 15 | 1022923413061632 |
| 16 | 30419533530730323 |
| 17 | 966125479213596672 |
| 18 | 32634383834158752258 |
| 19 | 1168128785923721920512 |