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 | 2 |
| 2 | 10 |
| 3 | 26 |
| 4 | 58 |
| 5 | 122 |
| 6 | 250 |
| 7 | 506 |
| 8 | 1018 |
| 9 | 2042 |
| 10 | 4090 |
| 11 | 8186 |
| 12 | 16378 |
| 13 | 32762 |
| 14 | 65530 |
| 15 | 131066 |
| 16 | 262138 |
| 17 | 524282 |
| 18 | 1048570 |
| 19 | 2097146 |
| 20 | 4194298 |
| 21 | 8388602 |
| 22 | 16777210 |
| 23 | 33554426 |
| 24 | 67108858 |
| 25 | 134217722 |
| 26 | 268435450 |
| 27 | 536870906 |
| 28 | 1073741818 |
| 29 | 2147483642 |