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 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 19 |
| 6 | 44 |
| 7 | 106 |
| 8 | 257 |
| 9 | 628 |
| 10 | 1549 |
| 11 | 3844 |
| 12 | 9588 |
| 13 | 24020 |
| 14 | 60391 |
| 15 | 152298 |
| 16 | 385085 |
| 17 | 975904 |
| 18 | 2478129 |
| 19 | 6303861 |
| 20 | 16060946 |
| 21 | 40977605 |
| 22 | 104682165 |
| 23 | 267730426 |
| 24 | 685451776 |
| 25 | 1756593392 |
| 26 | 4505537267 |
| 27 | 11565724164 |
| 28 | 29711413595 |
| 29 | 76379060176 |
| 30 | 196473781247 |