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 | 1 |
| 2 | 8 |
| 3 | 41 |
| 4 | 206 |
| 5 | 944 |
| 6 | 4188 |
| 7 | 17879 |
| 8 | 74424 |
| 9 | 303400 |
| 10 | 1218440 |
| 11 | 4833416 |
| 12 | 18992142 |
| 13 | 74057460 |
| 14 | 287035502 |
| 15 | 1107086841 |
| 16 | 4253339267 |
| 17 | 16289667330 |
| 18 | 62230152461 |
| 19 | 237255014892 |
| 20 | 903101912666 |
| 21 | 3433312226666 |
| 22 | 13039708953325 |
| 23 | 49488269035164 |