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 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 47 |
| 5 | 119 |
| 6 | 287 |
| 7 | 671 |
| 8 | 1535 |
| 9 | 3455 |
| 10 | 7679 |
| 11 | 16895 |
| 12 | 36863 |
| 13 | 79871 |
| 14 | 172031 |
| 15 | 368639 |
| 16 | 786431 |
| 17 | 1671167 |
| 18 | 3538943 |
| 19 | 7471103 |
| 20 | 15728639 |
| 21 | 33030143 |
| 22 | 69206015 |
| 23 | 144703487 |
| 24 | 301989887 |
| 25 | 629145599 |
| 26 | 1308622847 |
| 27 | 2717908991 |
| 28 | 5637144575 |
| 29 | 11676942335 |