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) |
|---|---|
| 2 | 1 |
| 3 | 31 |
| 4 | 806 |
| 5 | 20306 |
| 6 | 508431 |
| 7 | 12714681 |
| 8 | 317886556 |
| 9 | 7947261556 |
| 10 | 198682027181 |
| 11 | 4967053120931 |
| 12 | 124176340230306 |
| 13 | 3104408566792806 |
| 14 | 77610214474995931 |
| 15 | 1940255363400777181 |
| 16 | 48506384092648824056 |
| 17 | 1212659602354367574056 |
| 18 | 30316490059049924214681 |