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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 371 |
| 5 | 38163 |
| 6 | 2236504 |
| 7 | 103998636 |
| 8 | 4289058501 |
| 9 | 164693276181 |
| 10 | 6034793020298 |
| 11 | 213993130915542 |
| 12 | 7407880110115111 |
| 13 | 251837583669470799 |
| 14 | 8443568934653875932 |
| 15 | 280082506996725346368 |