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 | 19 |
| 2 | 361 |
| 3 | 1799 |
| 4 | 9994 |
| 5 | 66089 |
| 6 | 454223 |
| 7 | 3256420 |
| 8 | 23710041 |
| 9 | 175056303 |
| 10 | 1302289708 |
| 11 | 9745464669 |
| 12 | 73203597153 |
| 13 | 551383463124 |
| 14 | 4160799992187 |
| 15 | 31438884544745 |
| 16 | 237763980708800 |
| 17 | 1799270658075065 |
| 18 | 13621788512549441 |
| 19 | 103157746749440626 |