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 | 13 |
| 2 | 205 |
| 3 | 3277 |
| 4 | 52429 |
| 5 | 838861 |
| 6 | 13421773 |
| 7 | 214748365 |
| 8 | 3435973837 |
| 9 | 54975581389 |
| 10 | 879609302221 |
| 11 | 14073748835533 |
| 12 | 225179981368525 |
| 13 | 3602879701896397 |
| 14 | 57646075230342349 |
| 15 | 922337203685477581 |
| 16 | 14757395258967641293 |
| 17 | 236118324143482260685 |
| 18 | 3777893186295716170957 |