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 | 63 |
| 2 | 51 |
| 3 | 20 |
| 4 | 24 |
| 5 | 44 |
| 6 | 48 |
| 7 | 112 |
| 8 | 240 |
| 9 | 608 |
| 10 | 1552 |
| 11 | 3120 |
| 12 | 8144 |
| 13 | 16304 |
| 14 | 32624 |
| 15 | 65264 |
| 16 | 130544 |
| 17 | 264928 |
| 18 | 678448 |
| 19 | 1356912 |
| 20 | 4979232 |
| 21 | 19424016 |
| 22 | 58272480 |
| 23 | 226593936 |
| 24 | 763164288 |
| 25 | 3467499840 |
| 26 | 16339520448 |
| 27 | 65370077568 |
| 28 | 295266178368 |
| 29 | 1223245608192 |
| 30 | 6931725175296 |
| 31 | 40582548986112 |