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 | 9 |
| 2 | 81 |
| 3 | 164 |
| 4 | 436 |
| 5 | 1030 |
| 6 | 2032 |
| 7 | 4174 |
| 8 | 8266 |
| 9 | 16060 |
| 10 | 30670 |
| 11 | 57888 |
| 12 | 109188 |
| 13 | 202628 |
| 14 | 375252 |
| 15 | 692182 |
| 16 | 1267634 |
| 17 | 2319308 |
| 18 | 4224978 |
| 19 | 7679364 |
| 20 | 13935174 |
| 21 | 25221442 |
| 22 | 45611766 |
| 23 | 82350810 |
| 24 | 148518712 |
| 25 | 267668550 |
| 26 | 481894280 |
| 27 | 867169926 |
| 28 | 1559501878 |
| 29 | 2803131788 |