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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 764 |
| 11 | 5008 |
| 12 | 23980 |
| 13 | 98846 |
| 14 | 375950 |
| 15 | 1353992 |
| 16 | 4719178 |
| 17 | 16089515 |
| 18 | 54175927 |
| 19 | 182019983 |
| 20 | 614507621 |
| 21 | 2078949960 |
| 22 | 7035318948 |
| 23 | 23778288812 |
| 24 | 80187314884 |
| 25 | 269618757792 |
| 26 | 903570999504 |
| 27 | 3017802963584 |
| 28 | 10047020559840 |
| 29 | 33357290774560 |