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 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 16 |
| 5 | 44 |
| 6 | 111 |
| 7 | 268 |
| 8 | 627 |
| 9 | 1439 |
| 10 | 3250 |
| 11 | 7259 |
| 12 | 16050 |
| 13 | 35219 |
| 14 | 76730 |
| 15 | 166229 |
| 16 | 358180 |
| 17 | 768416 |
| 18 | 1641555 |
| 19 | 3494596 |
| 20 | 7414203 |
| 21 | 15685328 |
| 22 | 33091399 |
| 23 | 69647978 |
| 24 | 146250009 |
| 25 | 306490602 |
| 26 | 641044849 |
| 27 | 1338507476 |
| 28 | 2790140995 |
| 29 | 5807567462 |
| 30 | 12070739253 |
| 31 | 25056394988 |
| 32 | 51946330763 |
| 33 | 107573145767 |