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 | 0 |
| 3 | 5 |
| 4 | 4 |
| 5 | 49 |
| 6 | 108 |
| 7 | 637 |
| 8 | 2024 |
| 9 | 9329 |
| 10 | 34104 |
| 11 | 143621 |
| 12 | 554092 |
| 13 | 2255809 |
| 14 | 8883876 |
| 15 | 35708701 |
| 16 | 141734480 |
| 17 | 566950433 |
| 18 | 2257038576 |
| 19 | 9011796293 |
| 20 | 35916665428 |
| 21 | 143306508433 |
| 22 | 571395546204 |
| 23 | 2279250017533 |
| 24 | 9089366457656 |
| 25 | 36253101237521 |
| 26 | 144581807030568 |