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 | 17 |
| 6 | 34 |
| 7 | 75 |
| 8 | 150 |
| 9 | 339 |
| 10 | 678 |
| 11 | 1558 |
| 12 | 3116 |
| 13 | 7247 |
| 14 | 14494 |
| 15 | 34016 |
| 16 | 68032 |
| 17 | 160795 |
| 18 | 321590 |
| 19 | 764388 |
| 20 | 1528776 |
| 21 | 3650571 |
| 22 | 7301142 |
| 23 | 17501619 |
| 24 | 35003238 |
| 25 | 84179877 |
| 26 | 168359754 |
| 27 | 406020930 |
| 28 | 812041860 |
| 29 | 1963073865 |
| 30 | 3926147730 |