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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 30 |
| 5 | 75 |
| 6 | 206 |
| 7 | 518 |
| 8 | 1344 |
| 9 | 3357 |
| 10 | 8429 |
| 11 | 20759 |
| 12 | 51044 |
| 13 | 123973 |
| 14 | 299848 |
| 15 | 719197 |
| 16 | 1716563 |
| 17 | 4070800 |
| 18 | 9607797 |
| 19 | 22555988 |
| 20 | 52718749 |
| 21 | 122655485 |
| 22 | 284207304 |
| 23 | 655894527 |
| 24 | 1508046031 |
| 25 | 3454808143 |
| 26 | 7887768997 |
| 27 | 17949709753 |
| 28 | 40719611684 |
| 29 | 92096461012 |
| 30 | 207697731344 |