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 | 85 |
| 6 | 318 |
| 7 | 1234 |
| 8 | 4884 |
| 9 | 19458 |
| 10 | 77727 |
| 11 | 310761 |
| 12 | 1242853 |
| 13 | 4971151 |
| 14 | 19884270 |
| 15 | 79536639 |
| 16 | 318145993 |
| 17 | 1272583241 |
| 18 | 5090332042 |
| 19 | 20361326983 |
| 20 | 81445306447 |
| 21 | 325781223902 |
| 22 | 1303124893253 |
| 23 | 5212499570050 |
| 24 | 20849998276525 |
| 25 | 83399993101506 |
| 26 | 333599972400353 |