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 | 3 |
| 3 | 18 |
| 4 | 170 |
| 5 | 2200 |
| 6 | 36232 |
| 7 | 725200 |
| 8 | 17095248 |
| 9 | 463936896 |
| 10 | 14246942336 |
| 11 | 488428297984 |
| 12 | 18491942300416 |
| 13 | 766293946203136 |
| 14 | 34498781924766720 |
| 15 | 1676731077272217600 |
| 16 | 87501958444207351808 |
| 17 | 4880017252828686155776 |