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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 2 |
| 7 | 0 |
| 8 | 4 |
| 9 | 0 |
| 10 | 13 |
| 11 | 0 |
| 12 | 48 |
| 13 | 0 |
| 14 | 238 |
| 15 | 0 |
| 16 | 1325 |
| 17 | 0 |
| 18 | 8297 |
| 19 | 0 |
| 20 | 54519 |
| 21 | 0 |
| 22 | 373363 |
| 23 | 0 |
| 24 | 2621872 |
| 25 | 0 |
| 26 | 18797682 |
| 27 | 0 |
| 28 | 136969519 |
| 29 | 0 |
| 30 | 1011903735 |
| 31 | 0 |
| 32 | 7564219361 |
| 33 | 0 |
| 34 | 57129086391 |
| 35 | 0 |
| 36 | 435394899361 |
| 37 | 0 |
| 38 | 3345082819597 |
| 39 | 0 |
| 40 | 25885718422329 |
| 41 | 0 |
| 42 | 201619294539406 |
| 43 | 0 |
| 44 | 1579629974876090 |