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 | 15 |
| 2 | 121 |
| 3 | 3867 |
| 4 | 30943 |
| 5 | 495067 |
| 6 | 3960569 |
| 7 | 253475987 |
| 8 | 2027808611 |
| 9 | 32444935345 |
| 10 | 259559486959 |
| 11 | 8305903553295 |
| 12 | 66447228478363 |
| 13 | 1063155655468083 |
| 14 | 8505245244078969 |
| 15 | 1088671391232413187 |