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) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 12 |
| 3 | 113 |
| 4 | 351 |
| 5 | 3623 |
| 6 | 3974 |
| 7 | 19519 |
| 8 | 355316 |
| 9 | 374835 |
| 10 | 1479821 |
| 11 | 7773940 |
| 12 | 24801641 |
| 13 | 32575581 |
| 14 | 122528384 |
| 15 | 400160733 |
| 16 | 522689117 |
| 17 | 922849850 |
| 18 | 5136938367 |
| 19 | 16333664951 |
| 20 | 135806257975 |
| 21 | 152139922926 |
| 22 | 440086103827 |
| 23 | 592226026753 |