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 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 5 |
| 7 | 0 |
| 8 | 7 |
| 9 | 0 |
| 10 | 21 |
| 11 | 0 |
| 12 | 33 |
| 13 | 0 |
| 14 | 429 |
| 15 | 0 |
| 16 | 715 |
| 17 | 0 |
| 18 | 2431 |
| 19 | 0 |
| 20 | 4199 |
| 21 | 0 |
| 22 | 29393 |
| 23 | 0 |
| 24 | 52003 |
| 25 | 0 |
| 26 | 185725 |
| 27 | 0 |
| 28 | 334305 |
| 29 | 0 |
| 30 | 9694845 |
| 31 | 0 |
| 32 | 17678835 |
| 33 | 0 |
| 34 | 64822395 |
| 35 | 0 |
| 36 | 119409675 |
| 37 | 0 |
| 38 | 883631595 |
| 39 | 0 |
| 40 | 1641030105 |
| 41 | 0 |
| 42 | 6116566755 |
| 43 | 0 |
| 44 | 11435320455 |
| 45 | 0 |
| 46 | 171529806825 |
| 47 | 0 |