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 | 27 |
| 2 | 204 |
| 3 | 1479 |
| 4 | 10797 |
| 5 | 78729 |
| 6 | 574185 |
| 7 | 4187499 |
| 8 | 30539367 |
| 9 | 222722937 |
| 10 | 1624313781 |
| 11 | 11846086563 |
| 12 | 86393262903 |
| 13 | 630064268913 |
| 14 | 4595045605149 |
| 15 | 33511572001131 |
| 16 | 244399197416799 |
| 17 | 1782398262186441 |
| 18 | 12998993444433333 |
| 19 | 94801388754240819 |