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 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 40 |
| 6 | 106 |
| 7 | 316 |
| 8 | 1049 |
| 9 | 3830 |
| 10 | 15208 |
| 11 | 65072 |
| 12 | 297841 |
| 13 | 1449756 |
| 14 | 7468542 |
| 15 | 40555748 |
| 16 | 231335961 |
| 17 | 1381989882 |
| 18 | 8623700812 |
| 19 | 56078446616 |
| 20 | 379233142801 |
| 21 | 2662013133296 |
| 22 | 19362917622002 |
| 23 | 145719550012300 |
| 24 | 1133023004941273 |
| 25 | 9090156910550110 |
| 26 | 75161929739797520 |