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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 2 |
| 9 | 9 |
| 10 | 37 |
| 11 | 121 |
| 12 | 331 |
| 13 | 793 |
| 14 | 1717 |
| 15 | 3433 |
| 16 | 6437 |
| 17 | 11456 |
| 18 | 19569 |
| 19 | 32505 |
| 20 | 53449 |
| 21 | 89149 |
| 22 | 155041 |
| 23 | 286825 |
| 24 | 564929 |
| 25 | 1163317 |
| 26 | 2442210 |
| 27 | 5117225 |
| 28 | 10558381 |
| 29 | 21308121 |
| 30 | 41973391 |
| 31 | 80778601 |
| 32 | 152344397 |
| 33 | 282855561 |
| 34 | 520060249 |
| 35 | 953217792 |
| 36 | 1753553441 |
| 37 | 3256528177 |
| 38 | 6127896977 |
| 39 | 11694334137 |