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 | 4 |
| 3 | 13 |
| 4 | 36 |
| 5 | 91 |
| 6 | 218 |
| 7 | 505 |
| 8 | 1144 |
| 9 | 2551 |
| 10 | 5622 |
| 11 | 12277 |
| 12 | 26612 |
| 13 | 57331 |
| 14 | 122866 |
| 15 | 262129 |
| 16 | 557040 |
| 17 | 1179631 |
| 18 | 2490350 |
| 19 | 5242861 |
| 20 | 11010028 |
| 21 | 23068651 |
| 22 | 48234474 |
| 23 | 100663273 |
| 24 | 209715176 |
| 25 | 436207591 |
| 26 | 905969638 |
| 27 | 1879048165 |
| 28 | 3892314084 |
| 29 | 8053063651 |
| 30 | 16642998242 |
| 31 | 34359738337 |