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 | 9 |
| 2 | 83 |
| 3 | 1027 |
| 4 | 15629 |
| 5 | 279941 |
| 6 | 5764807 |
| 7 | 134217735 |
| 8 | 3486784409 |
| 9 | 100000000009 |
| 10 | 3138428376731 |
| 11 | 106993205379083 |
| 12 | 3937376385699301 |
| 13 | 155568095557812237 |
| 14 | 6568408355712890639 |
| 15 | 295147905179352825871 |