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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 18 |
| 6 | 34 |
| 7 | 68 |
| 8 | 140 |
| 9 | 280 |
| 10 | 556 |
| 11 | 1114 |
| 12 | 2232 |
| 13 | 4468 |
| 14 | 8932 |
| 15 | 17860 |
| 16 | 35718 |
| 17 | 71446 |
| 18 | 142900 |
| 19 | 285800 |
| 20 | 571592 |
| 21 | 1143174 |
| 22 | 2286348 |
| 23 | 4572708 |
| 24 | 9145434 |
| 25 | 18290876 |
| 26 | 36581744 |
| 27 | 73163470 |
| 28 | 146326928 |
| 29 | 292653860 |
| 30 | 585307730 |
| 31 | 1170615490 |
| 32 | 2341231006 |
| 33 | 4682462012 |
| 34 | 9364923998 |