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 | 3 |
| 3 | 8 |
| 4 | 25 |
| 5 | 83 |
| 6 | 289 |
| 7 | 1041 |
| 8 | 3847 |
| 9 | 14504 |
| 10 | 55569 |
| 11 | 215727 |
| 12 | 846761 |
| 13 | 3354858 |
| 14 | 13398965 |
| 15 | 53888063 |
| 16 | 218053915 |
| 17 | 887107888 |
| 18 | 3626373205 |
| 19 | 14887942624 |
| 20 | 61358959587 |
| 21 | 253771944529 |
| 22 | 1052917272543 |
| 23 | 4381374717994 |
| 24 | 18280470530047 |
| 25 | 76459765772375 |