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 | 7 |
| 2 | 49 |
| 3 | 219 |
| 4 | 908 |
| 5 | 3642 |
| 6 | 14265 |
| 7 | 54914 |
| 8 | 209116 |
| 9 | 790202 |
| 10 | 2970663 |
| 11 | 11127947 |
| 12 | 41582147 |
| 13 | 155115627 |
| 14 | 577944508 |
| 15 | 2151567661 |
| 16 | 8005167634 |
| 17 | 29772011406 |
| 18 | 110693241831 |
| 19 | 411477718640 |
| 20 | 1529360380741 |
| 21 | 5683684052119 |
| 22 | 21121242014609 |
| 23 | 78485142931206 |