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 | 0 |
| 2 | 3 |
| 3 | 0 |
| 4 | 17 |
| 5 | 6 |
| 6 | 115 |
| 7 | 100 |
| 8 | 867 |
| 9 | 1236 |
| 10 | 7117 |
| 11 | 13770 |
| 12 | 62545 |
| 13 | 146866 |
| 14 | 579387 |
| 15 | 1537920 |
| 16 | 5581725 |
| 17 | 16002810 |
| 18 | 55329435 |
| 19 | 166465820 |
| 20 | 559913787 |
| 21 | 1736268432 |
| 22 | 5752600961 |
| 23 | 18182999274 |
| 24 | 59777071435 |
| 25 | 191287075320 |