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 | 6 |
| 2 | 10 |
| 3 | 20 |
| 4 | 42 |
| 5 | 92 |
| 6 | 204 |
| 7 | 454 |
| 8 | 1010 |
| 9 | 2242 |
| 10 | 4962 |
| 11 | 10946 |
| 12 | 24066 |
| 13 | 52736 |
| 14 | 115186 |
| 15 | 250800 |
| 16 | 544432 |
| 17 | 1178432 |
| 18 | 2543712 |
| 19 | 5476352 |
| 20 | 11760642 |
| 21 | 25196566 |
| 22 | 53861008 |
| 23 | 114889430 |
| 24 | 244571174 |
| 25 | 519630462 |
| 26 | 1102021562 |
| 27 | 2333088968 |
| 28 | 4931232086 |
| 29 | 10406327848 |
| 30 | 21927562520 |
| 31 | 46138651012 |