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 | 3 |
| 4 | 3 |
| 5 | 9 |
| 6 | 9 |
| 7 | 29 |
| 8 | 29 |
| 9 | 99 |
| 10 | 99 |
| 11 | 351 |
| 12 | 351 |
| 13 | 1273 |
| 14 | 1273 |
| 15 | 4679 |
| 16 | 4679 |
| 17 | 17341 |
| 18 | 17341 |
| 19 | 64637 |
| 20 | 64637 |
| 21 | 242019 |
| 22 | 242019 |
| 23 | 909789 |
| 24 | 909789 |
| 25 | 3432751 |
| 26 | 3432751 |
| 27 | 12998311 |
| 28 | 12998311 |
| 29 | 49387289 |
| 30 | 49387289 |
| 31 | 188261329 |
| 32 | 188261329 |
| 33 | 719860679 |
| 34 | 719860679 |
| 35 | 2760525963 |
| 36 | 2760525963 |
| 37 | 10614508493 |
| 38 | 10614508493 |