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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 27 |
| 5 | 91 |
| 6 | 373 |
| 7 | 1457 |
| 8 | 6163 |
| 9 | 25795 |
| 10 | 111897 |
| 11 | 486421 |
| 12 | 2153429 |
| 13 | 9584901 |
| 14 | 43121211 |
| 15 | 195082479 |
| 16 | 888861555 |
| 17 | 4069956979 |
| 18 | 18732710281 |
| 19 | 86579713685 |
| 20 | 401776434017 |
| 21 | 1870946532705 |
| 22 | 8740907398527 |
| 23 | 40956105551603 |