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 | 33 |
| 3 | 146 |
| 4 | 594 |
| 5 | 2196 |
| 6 | 7687 |
| 7 | 25410 |
| 8 | 80664 |
| 9 | 246258 |
| 10 | 728610 |
| 11 | 2093334 |
| 12 | 5865853 |
| 13 | 16057998 |
| 14 | 43063812 |
| 15 | 113293158 |
| 16 | 292928448 |
| 17 | 745216692 |
| 18 | 1867840830 |
| 19 | 4616732712 |
| 20 | 11264133069 |
| 21 | 27149243724 |
| 22 | 64691795178 |