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 | 6 |
| 2 | 14 |
| 3 | 44 |
| 4 | 150 |
| 5 | 532 |
| 6 | 1932 |
| 7 | 7128 |
| 8 | 26598 |
| 9 | 100100 |
| 10 | 379236 |
| 11 | 1444456 |
| 12 | 5525884 |
| 13 | 21217224 |
| 14 | 81719000 |
| 15 | 315583920 |
| 16 | 1221550470 |
| 17 | 4737927780 |
| 18 | 18409560180 |
| 19 | 71645805000 |
| 20 | 279227584020 |
| 21 | 1089643989720 |
| 22 | 4257130461480 |
| 23 | 16649826582480 |
| 24 | 65181326593500 |
| 25 | 255401021170152 |