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 | 13 |
| 2 | 23 |
| 3 | 40 |
| 4 | 71 |
| 5 | 127 |
| 6 | 230 |
| 7 | 421 |
| 8 | 779 |
| 9 | 1456 |
| 10 | 2747 |
| 11 | 5227 |
| 12 | 10022 |
| 13 | 19345 |
| 14 | 37559 |
| 15 | 73288 |
| 16 | 143615 |
| 17 | 282439 |
| 18 | 557126 |
| 19 | 1101709 |
| 20 | 2183123 |
| 21 | 4333408 |
| 22 | 8613683 |
| 23 | 17141395 |
| 24 | 34143686 |
| 25 | 68062297 |
| 26 | 135760415 |
| 27 | 270931576 |
| 28 | 540909719 |
| 29 | 1080276751 |
| 30 | 2158057382 |
| 31 | 4312075957 |