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 | 3 |
| 2 | 9 |
| 3 | 92 |
| 4 | 749 |
| 5 | 4430 |
| 6 | 30076 |
| 7 | 217579 |
| 8 | 1479055 |
| 9 | 10046609 |
| 10 | 69575902 |
| 11 | 479035195 |
| 12 | 3284657308 |
| 13 | 22593041544 |
| 14 | 155444686265 |
| 15 | 1068352050847 |
| 16 | 7344626541715 |
| 17 | 50504764148658 |
| 18 | 347234420131143 |
| 19 | 2387280989007848 |
| 20 | 16413850076764282 |
| 21 | 112852648679477233 |
| 22 | 775901649656851817 |