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 | 1 |
| 3 | 26 |
| 4 | 1089 |
| 5 | 70124 |
| 6 | 6495985 |
| 7 | 821315214 |
| 8 | 136115947009 |
| 9 | 28651724077976 |
| 10 | 7470040450004001 |
| 11 | 2363470644596843330 |
| 12 | 892244303052345224641 |
| 13 | 396227360441775922668036 |
| 14 | 204487588996059177697597969 |
| 15 | 121370399839482643287189048374 |