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 | 16 |
| 2 | 152 |
| 3 | 1120 |
| 4 | 6972 |
| 5 | 38368 |
| 6 | 191968 |
| 7 | 889184 |
| 8 | 3862214 |
| 9 | 15881616 |
| 10 | 62275840 |
| 11 | 234205472 |
| 12 | 848652120 |
| 13 | 2974133152 |
| 14 | 10112507808 |
| 15 | 33448941824 |
| 16 | 107874784017 |
| 17 | 339879773648 |
| 18 | 1047953793136 |
| 19 | 3166817754880 |
| 20 | 9391718326404 |
| 21 | 27366626142688 |
| 22 | 78435144301696 |
| 23 | 221322772710464 |
| 24 | 615375631077094 |