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 | 1 |
| 2 | 6 |
| 3 | 56 |
| 4 | 336 |
| 5 | 1840 |
| 6 | 7925 |
| 7 | 29183 |
| 8 | 91621 |
| 9 | 256546 |
| 10 | 648697 |
| 11 | 1508107 |
| 12 | 3267671 |
| 13 | 6679409 |
| 14 | 12957976 |
| 15 | 24015317 |
| 16 | 42810244 |
| 17 | 73793984 |
| 18 | 123240964 |
| 19 | 200260099 |
| 20 | 317487746 |
| 21 | 492199068 |
| 22 | 747720800 |
| 23 | 1115115145 |
| 24 | 1634875673 |
| 25 | 2360312092 |
| 26 | 3358519981 |
| 27 | 4716186332 |
| 28 | 6541418450 |