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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 38 |
| 6 | 86 |
| 7 | 192 |
| 8 | 426 |
| 9 | 938 |
| 10 | 2048 |
| 11 | 4438 |
| 12 | 9558 |
| 13 | 20480 |
| 14 | 43690 |
| 15 | 92842 |
| 16 | 196608 |
| 17 | 415062 |
| 18 | 873814 |
| 19 | 1835008 |
| 20 | 3844778 |
| 21 | 8039082 |
| 22 | 16777216 |
| 23 | 34952534 |
| 24 | 72701270 |
| 25 | 150994944 |
| 26 | 313174698 |
| 27 | 648719018 |
| 28 | 1342177280 |
| 29 | 2773833046 |
| 30 | 5726623062 |