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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 5 |
| 11 | 6 |
| 12 | 0 |
| 13 | 1 |
| 14 | 5005 |
| 15 | 0 |
| 16 | 32352 |
| 17 | 215511 |
| 18 | 1 |
| 19 | 160 |
| 20 | 1600 |
| 21 | 1937 |
| 22 | 52374735 |
| 23 | 11374351128 |
| 24 | 100368000 |
| 25 | 248032486000 |
| 26 | 677497393 |
| 27 | 5166569025792 |
| 28 | 84527951721264 |
| 29 | 154849134310100 |
| 30 | 774245674466500 |
| 31 | 18868327574531760 |
| 32 | 201758301050363904 |
| 33 | 40887062103450025 |