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 | 3876 |
| 2 | 15960 |
| 3 | 66378 |
| 4 | 276762 |
| 5 | 1152576 |
| 6 | 4791012 |
| 7 | 19906740 |
| 8 | 82727094 |
| 9 | 343911336 |
| 10 | 1430080296 |
| 11 | 5946396012 |
| 12 | 24722787264 |
| 13 | 102780120750 |
| 14 | 427285990662 |
| 15 | 1776417823830 |
| 16 | 7385542897866 |
| 17 | 30705819911322 |
| 18 | 127659940718424 |