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 | 0 |
| 2 | 8 |
| 3 | 10 |
| 4 | 42 |
| 5 | 72 |
| 6 | 176 |
| 7 | 354 |
| 8 | 764 |
| 9 | 1516 |
| 10 | 3022 |
| 11 | 6066 |
| 12 | 12268 |
| 13 | 24570 |
| 14 | 49148 |
| 15 | 98246 |
| 16 | 196530 |
| 17 | 393158 |
| 18 | 786406 |
| 19 | 1572834 |
| 20 | 3145674 |
| 21 | 6291440 |
| 22 | 12582874 |
| 23 | 25165764 |
| 24 | 50331634 |
| 25 | 100663192 |
| 26 | 201326576 |
| 27 | 402653180 |
| 28 | 805306350 |
| 29 | 1610612690 |
| 30 | 3221225038 |