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 | 10 |
| 2 | 145 |
| 3 | 2575 |
| 4 | 53935 |
| 5 | 1305070 |
| 6 | 35924902 |
| 7 | 1111107544 |
| 8 | 38212134595 |
| 9 | 1448428857802 |
| 10 | 60055380515614 |
| 11 | 2705916453572344 |
| 12 | 131733359512179916 |
| 13 | 6894586916062176161 |
| 14 | 386203389346756538342 |
| 15 | 23061963945353367894173 |