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 | 3 |
| 5 | 1 |
| 6 | 0 |
| 7 | 18 |
| 8 | 6 |
| 9 | 1 |
| 10 | 0 |
| 11 | 135 |
| 12 | 45 |
| 13 | 9 |
| 14 | 1 |
| 15 | 0 |
| 16 | 1134 |
| 17 | 378 |
| 18 | 81 |
| 19 | 12 |
| 20 | 1 |
| 21 | 0 |
| 22 | 10206 |
| 23 | 3402 |
| 24 | 756 |
| 25 | 126 |
| 26 | 15 |
| 27 | 1 |
| 28 | 0 |
| 29 | 96228 |
| 30 | 32076 |
| 31 | 7290 |
| 32 | 1296 |
| 33 | 180 |
| 34 | 18 |
| 35 | 1 |
| 36 | 0 |
| 37 | 938223 |
| 38 | 312741 |
| 39 | 72171 |
| 40 | 13365 |
| 41 | 2025 |
| 42 | 243 |
| 43 | 21 |
| 44 | 1 |
| 45 | 0 |
| 46 | 9382230 |
| 47 | 3127410 |
| 48 | 729729 |
| 49 | 138996 |
| 50 | 22275 |
| 51 | 2970 |
| 52 | 315 |
| 53 | 24 |
| 54 | 1 |
| 55 | 0 |