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) |
|---|---|
| 1 | 8 |
| 2 | 21 |
| 3 | 80 |
| 4 | 318 |
| 5 | 1315 |
| 6 | 5364 |
| 7 | 21680 |
| 8 | 87452 |
| 9 | 352931 |
| 10 | 1425261 |
| 11 | 5757064 |
| 12 | 23253889 |
| 13 | 93921193 |
| 14 | 379334811 |
| 15 | 1532086339 |
| 16 | 6187939435 |
| 17 | 24992490166 |
| 18 | 100942222266 |
| 19 | 407695589939 |
| 20 | 1646641727295 |
| 21 | 6650621491464 |
| 22 | 26861196902537 |
| 23 | 108489696252447 |