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 | 36 |
| 3 | 98 |
| 4 | 271 |
| 5 | 677 |
| 6 | 1504 |
| 7 | 3399 |
| 8 | 7220 |
| 9 | 15184 |
| 10 | 31664 |
| 11 | 64749 |
| 12 | 132543 |
| 13 | 268994 |
| 14 | 544151 |
| 15 | 1099824 |
| 16 | 2215226 |
| 17 | 4461522 |
| 18 | 8974915 |
| 19 | 18040615 |
| 20 | 36261642 |
| 21 | 72844037 |
| 22 | 146324852 |
| 23 | 293885650 |
| 24 | 590165228 |
| 25 | 1185140667 |
| 26 | 2379732659 |
| 27 | 4778367860 |
| 28 | 9594547523 |