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 | 1 |
| 1 | 12 |
| 2 | 167 |
| 3 | 1312 |
| 4 | 15243 |
| 5 | 218149 |
| 6 | 18053887 |
| 7 | 16744993 |
| 8 | 9564235169 |
| 9 | 60519568871 |
| 10 | 2162548405277 |
| 11 | 1042027382717 |
| 12 | 495498798823907 |
| 13 | 142936348776673 |
| 14 | 502871478378225709 |
| 15 | 2136147813028051787 |
| 16 | 201533194180774871969 |