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 | 111 |
| 2 | 3191 |
| 3 | 43561 |
| 4 | 365751 |
| 5 | 2181257 |
| 6 | 10106977 |
| 7 | 38619087 |
| 8 | 126825227 |
| 9 | 368750757 |
| 10 | 970336269 |
| 11 | 2349638259 |
| 12 | 5303497629 |
| 13 | 11272376259 |
| 14 | 22745345019 |
| 15 | 43859522037 |
| 16 | 81262792557 |
| 17 | 145325576067 |
| 18 | 251806927307 |