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 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 19 |
| 5 | 27 |
| 6 | 100 |
| 7 | 227 |
| 8 | 781 |
| 9 | 1008 |
| 10 | 3805 |
| 11 | 4813 |
| 12 | 148195 |
| 13 | 153008 |
| 14 | 760227 |
| 15 | 913235 |
| 16 | 2586697 |
| 17 | 24193508 |
| 18 | 147747745 |
| 19 | 615184488 |
| 20 | 762932233 |
| 21 | 1378116721 |
| 22 | 3519165675 |
| 23 | 26012276446 |
| 24 | 55543718567 |
| 25 | 192643432147 |
| 26 | 440830582861 |
| 27 | 633474015008 |
| 28 | 4241674672909 |
| 29 | 4875148687917 |