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 | 5 |
| 3 | 16 |
| 4 | 21 |
| 5 | 58 |
| 6 | 137 |
| 7 | 195 |
| 8 | 722 |
| 9 | 3083 |
| 10 | 3805 |
| 11 | 56353 |
| 12 | 60158 |
| 13 | 296985 |
| 14 | 951113 |
| 15 | 1248098 |
| 16 | 3447309 |
| 17 | 8142716 |
| 18 | 11590025 |
| 19 | 42912791 |
| 20 | 183241189 |
| 21 | 226153980 |
| 22 | 3349396909 |
| 23 | 3575550889 |
| 24 | 17651600465 |
| 25 | 56530352284 |
| 26 | 74181952749 |
| 27 | 204894257782 |
| 28 | 483970468313 |
| 29 | 688864726095 |