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 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 1 |
| 4 | 16 |
| 5 | 10 |
| 6 | 59 |
| 7 | 60 |
| 8 | 330 |
| 9 | 397 |
| 10 | 1520 |
| 11 | 2218 |
| 12 | 7875 |
| 13 | 12820 |
| 14 | 39250 |
| 15 | 70045 |
| 16 | 202168 |
| 17 | 384866 |
| 18 | 1038051 |
| 19 | 2073580 |
| 20 | 5385754 |
| 21 | 11156701 |
| 22 | 28015232 |
| 23 | 59580154 |
| 24 | 146333795 |
| 25 | 317517636 |
| 26 | 766142242 |
| 27 | 1686735709 |
| 28 | 4019319048 |
| 29 | 8946988370 |
| 30 | 21116854115 |
| 31 | 47386013020 |
| 32 | 111065223914 |