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) |
|---|---|
| 1 | 16 |
| 2 | 21 |
| 3 | 42 |
| 4 | 101 |
| 5 | 257 |
| 6 | 691 |
| 7 | 1734 |
| 8 | 4502 |
| 9 | 11524 |
| 10 | 30121 |
| 11 | 77399 |
| 12 | 200317 |
| 13 | 516438 |
| 14 | 1338344 |
| 15 | 3454506 |
| 16 | 8931187 |
| 17 | 23069491 |
| 18 | 59659415 |
| 19 | 154144020 |
| 20 | 398416450 |
| 21 | 1029570334 |
| 22 | 2661273981 |
| 23 | 6877566431 |
| 24 | 17775332669 |
| 25 | 45938756798 |
| 26 | 118731629576 |
| 27 | 306855446658 |