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 | 4 |
| 1 | 38 |
| 2 | 1556 |
| 3 | 86606 |
| 4 | 4083404 |
| 5 | 171658094 |
| 6 | 6716224724 |
| 7 | 247782290006 |
| 8 | 8763080657420 |
| 9 | 299863491723614 |
| 10 | 9990667099305740 |
| 11 | 325847250824377382 |
| 12 | 10445562407382412028 |
| 13 | 330039152364735149222 |
| 14 | 10301457052184951857604 |
| 15 | 318211810358946705058382 |