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 | 10 |
| 4 | 24 |
| 5 | 60 |
| 6 | 150 |
| 7 | 376 |
| 8 | 944 |
| 9 | 2372 |
| 10 | 5962 |
| 11 | 14988 |
| 12 | 37684 |
| 13 | 94752 |
| 14 | 238252 |
| 15 | 599090 |
| 16 | 1506440 |
| 17 | 3788036 |
| 18 | 9525280 |
| 19 | 23952020 |
| 20 | 60229184 |
| 21 | 151450970 |
| 22 | 380835368 |
| 23 | 957640640 |
| 24 | 2408063340 |
| 25 | 6055266600 |
| 26 | 15226449480 |
| 27 | 38288118984 |
| 28 | 96278523274 |
| 29 | 242100012876 |
| 30 | 608779761460 |
| 31 | 1530825191912 |