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 | 3 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 6 |
| 8 | 12 |
| 9 | 27 |
| 10 | 59 |
| 11 | 133 |
| 12 | 307 |
| 13 | 725 |
| 14 | 1743 |
| 15 | 4251 |
| 16 | 10509 |
| 17 | 26285 |
| 18 | 66430 |
| 19 | 169450 |
| 20 | 435848 |
| 21 | 1129505 |
| 22 | 2947131 |
| 23 | 7737583 |
| 24 | 20430377 |
| 25 | 54226471 |
| 26 | 144621405 |
| 27 | 387420489 |
| 28 | 1042127936 |
| 29 | 2813988985 |
| 30 | 7625597484 |
| 31 | 20733556989 |
| 32 | 56549688380 |