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 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 48 |
| 6 | 90 |
| 7 | 174 |
| 8 | 336 |
| 9 | 648 |
| 10 | 1218 |
| 11 | 2328 |
| 12 | 4416 |
| 13 | 8388 |
| 14 | 15780 |
| 15 | 29892 |
| 16 | 56268 |
| 17 | 106200 |
| 18 | 199350 |
| 19 | 375504 |
| 20 | 704304 |
| 21 | 1323996 |
| 22 | 2479692 |
| 23 | 4654464 |
| 24 | 8710212 |
| 25 | 16328220 |
| 26 | 30526374 |
| 27 | 57161568 |
| 28 | 106794084 |
| 29 | 199788408 |
| 30 | 372996450 |
| 31 | 697217994 |
| 32 | 1300954248 |