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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 36 |
| 6 | 78 |
| 7 | 378 |
| 8 | 1953 |
| 9 | 20706 |
| 10 | 23436 |
| 11 | 48828 |
| 12 | 147696 |
| 13 | 239778 |
| 14 | 426426 |
| 15 | 449826 |
| 16 | 1220703 |
| 17 | 2155926 |
| 18 | 6011778 |
| 19 | 14625936 |
| 20 | 30517578 |
| 21 | 74218836 |
| 22 | 74316336 |
| 23 | 149083278 |
| 24 | 314290056 |
| 25 | 351562386 |
| 26 | 762939453 |
| 27 | 7897542681 |
| 28 | 9141750936 |
| 29 | 10201418541 |
| 30 | 19073486328 |
| 31 | 35952613476 |
| 32 | 38218245156 |