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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 2 |
| 11 | 5 |
| 12 | 15 |
| 13 | 64 |
| 14 | 342 |
| 15 | 2344 |
| 16 | 19137 |
| 17 | 181098 |
| 18 | 1922215 |
| 19 | 22472875 |
| 20 | 284556458 |
| 21 | 3849828695 |
| 22 | 54974808527 |
| 23 | 819865209740 |
| 24 | 12655913153775 |
| 25 | 200748351368185 |
| 26 | 3253193955012557 |
| 27 | 53619437319817482 |
| 28 | 895778170144927928 |
| 29 | 15129118461773051724 |