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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 46 |
| 6 | 105 |
| 7 | 243 |
| 8 | 560 |
| 9 | 1296 |
| 10 | 2994 |
| 11 | 6928 |
| 12 | 16019 |
| 13 | 37060 |
| 14 | 85713 |
| 15 | 198282 |
| 16 | 458636 |
| 17 | 1060932 |
| 18 | 2454070 |
| 19 | 5676750 |
| 20 | 13131210 |
| 21 | 30374892 |
| 22 | 70262196 |
| 23 | 162528916 |
| 24 | 375957183 |
| 25 | 869654746 |
| 26 | 2011661506 |
| 27 | 4653323265 |
| 28 | 10763942479 |
| 29 | 24898869052 |
| 30 | 57595401116 |
| 31 | 133228161565 |