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 | 4 |
| 3 | 31 |
| 4 | 361 |
| 5 | 5626 |
| 6 | 109951 |
| 7 | 2585269 |
| 8 | 71066626 |
| 9 | 2236441141 |
| 10 | 79289379361 |
| 11 | 3127129674736 |
| 12 | 135802922499949 |
| 13 | 6439320471558781 |
| 14 | 331026965612789356 |
| 15 | 18338413238239145731 |
| 16 | 1089132347371148170381 |
| 17 | 69033182553940825258594 |
| 18 | 4651256393180943757676371 |