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 | 6 |
| 3 | 18 |
| 4 | 42 |
| 5 | 90 |
| 6 | 186 |
| 7 | 378 |
| 8 | 762 |
| 9 | 1530 |
| 10 | 3066 |
| 11 | 6138 |
| 12 | 12282 |
| 13 | 24570 |
| 14 | 49146 |
| 15 | 98298 |
| 16 | 196602 |
| 17 | 393210 |
| 18 | 786426 |
| 19 | 1572858 |
| 20 | 3145722 |
| 21 | 6291450 |
| 22 | 12582906 |
| 23 | 25165818 |
| 24 | 50331642 |
| 25 | 100663290 |
| 26 | 201326586 |
| 27 | 402653178 |
| 28 | 805306362 |
| 29 | 1610612730 |
| 30 | 3221225466 |
| 31 | 6442450938 |
| 32 | 12884901882 |