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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 6 |
| 6 | 26 |
| 7 | 84 |
| 8 | 269 |
| 9 | 870 |
| 10 | 2910 |
| 11 | 9788 |
| 12 | 33250 |
| 13 | 114012 |
| 14 | 394260 |
| 15 | 1372776 |
| 16 | 4809917 |
| 17 | 16947462 |
| 18 | 60012470 |
| 19 | 213462380 |
| 20 | 762355286 |
| 21 | 2732658484 |
| 22 | 9827926060 |
| 23 | 35453715480 |
| 24 | 128255260690 |
| 25 | 465163021788 |
| 26 | 1691086242796 |
| 27 | 6161413737176 |
| 28 | 22494722099492 |
| 29 | 82282062468600 |
| 30 | 301507924857768 |
| 31 | 1106652847697872 |
| 32 | 4068159345287325 |
| 33 | 14976738917364166 |