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 | 12 |
| 2 | 144 |
| 3 | 556 |
| 4 | 2239 |
| 5 | 10570 |
| 6 | 42167 |
| 7 | 158217 |
| 8 | 616386 |
| 9 | 2348280 |
| 10 | 8718366 |
| 11 | 32527713 |
| 12 | 121179612 |
| 13 | 448121671 |
| 14 | 1656554267 |
| 15 | 6126075658 |
| 16 | 22616670998 |
| 17 | 83456777796 |
| 18 | 308017759907 |
| 19 | 1136469054610 |
| 20 | 4192305708517 |
| 21 | 15465595040747 |
| 22 | 57051037851614 |