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 | 1 |
| 2 | 9 |
| 3 | 44 |
| 4 | 160 |
| 5 | 491 |
| 6 | 1355 |
| 7 | 3486 |
| 8 | 8546 |
| 9 | 20245 |
| 10 | 46773 |
| 11 | 106048 |
| 12 | 236980 |
| 13 | 523535 |
| 14 | 1145935 |
| 15 | 2489202 |
| 16 | 5372534 |
| 17 | 11532633 |
| 18 | 24639513 |
| 19 | 52426420 |
| 20 | 111146280 |
| 21 | 234877811 |
| 22 | 494924179 |
| 23 | 1040183174 |
| 24 | 2181033290 |
| 25 | 4563397341 |
| 26 | 9529452605 |