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 | 11 |
| 3 | 103 |
| 4 | 1373 |
| 5 | 20657 |
| 6 | 381795 |
| 7 | 7921825 |
| 8 | 187452793 |
| 9 | 4916743582 |
| 10 | 142471278944 |
| 11 | 4506381463150 |
| 12 | 154747691135574 |
| 13 | 5729252807696052 |
| 14 | 227595085199164036 |
| 15 | 9654855890695727316 |
| 16 | 435664037303036699736 |
| 17 | 20836069678062430493950 |
| 18 | 1052867409176853099312712 |