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 | 8 |
| 2 | 43 |
| 3 | 211 |
| 4 | 1030 |
| 5 | 5055 |
| 6 | 24851 |
| 7 | 122166 |
| 8 | 600470 |
| 9 | 2951330 |
| 10 | 14505951 |
| 11 | 71297834 |
| 12 | 350434385 |
| 13 | 1722411860 |
| 14 | 8465785506 |
| 15 | 41609980404 |
| 16 | 204516223418 |
| 17 | 1005212819668 |
| 18 | 4940697593195 |
| 19 | 24283905085013 |
| 20 | 119357243593561 |
| 21 | 586649945651116 |