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 | 8 |
| 1 | 29 |
| 2 | 113 |
| 3 | 449 |
| 4 | 1793 |
| 5 | 7169 |
| 6 | 28673 |
| 7 | 114689 |
| 8 | 458753 |
| 9 | 1835009 |
| 10 | 7340033 |
| 11 | 29360129 |
| 12 | 117440513 |
| 13 | 469762049 |
| 14 | 1879048193 |
| 15 | 7516192769 |
| 16 | 30064771073 |
| 17 | 120259084289 |
| 18 | 481036337153 |
| 19 | 1924145348609 |
| 20 | 7696581394433 |
| 21 | 30786325577729 |