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 | 1 |
| 2 | 14 |
| 3 | 818 |
| 4 | 141 |
| 5 | 13063 |
| 6 | 16774564 |
| 7 | 1057052 |
| 8 | 4651811 |
| 9 | 778001383 |
| 10 | 1947352646 |
| 11 | 1073136102266 |
| 12 | 72379420806883 |
| 13 | 112229882767 |
| 14 | 120372921248744 |
| 15 | 13224581478608216 |
| 16 | 2077531074698521033 |
| 17 | 517938126297258811 |
| 18 | 13785854249175914469406 |
| 19 | 343586489824688536178 |
| 20 | 1958290344469311726833 |