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 | 2 |
| 2 | 9 |
| 3 | 34 |
| 4 | 124 |
| 5 | 444 |
| 6 | 1567 |
| 7 | 5466 |
| 8 | 18885 |
| 9 | 64732 |
| 10 | 220403 |
| 11 | 746166 |
| 12 | 2513678 |
| 13 | 8431650 |
| 14 | 28175256 |
| 15 | 93834240 |
| 16 | 311565255 |
| 17 | 1031723268 |
| 18 | 3408137644 |
| 19 | 11233323692 |
| 20 | 36950587185 |
| 21 | 121319416734 |
| 22 | 397649266199 |
| 23 | 1301332828086 |
| 24 | 4252515425757 |
| 25 | 13877722224278 |
| 26 | 45232020345642 |