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 | 4 |
| 3 | 12 |
| 4 | 37 |
| 5 | 110 |
| 6 | 327 |
| 7 | 968 |
| 8 | 2864 |
| 9 | 8469 |
| 10 | 25040 |
| 11 | 74029 |
| 12 | 218856 |
| 13 | 647008 |
| 14 | 1912753 |
| 15 | 5654670 |
| 16 | 16716883 |
| 17 | 49420052 |
| 18 | 146100276 |
| 19 | 431915561 |
| 20 | 1276869920 |
| 21 | 3774804441 |
| 22 | 11159436284 |
| 23 | 32990587972 |
| 24 | 97529916957 |
| 25 | 288327225550 |
| 26 | 852380393407 |
| 27 | 2519888066928 |
| 28 | 7449533000584 |
| 29 | 22023018662909 |