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 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 171 |
| 5 | 3113 |
| 6 | 106419 |
| 7 | 7035649 |
| 8 | 915028347 |
| 9 | 236101213721 |
| 10 | 121358941877763 |
| 11 | 124515003203007345 |
| 12 | 255256125633703622475 |
| 13 | 1046039978882750301409545 |
| 14 | 8571252355254982356001107795 |
| 15 | 140448544236464264647066322058465 |
| 16 | 4602498820363674769217316088142020635 |