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 | 42 |
| 1 | 174 |
| 2 | 645 |
| 3 | 2333 |
| 4 | 8398 |
| 5 | 30275 |
| 6 | 109550 |
| 7 | 398180 |
| 8 | 1453908 |
| 9 | 5332407 |
| 10 | 19639521 |
| 11 | 72616727 |
| 12 | 269473750 |
| 13 | 1003347975 |
| 14 | 3747412770 |
| 15 | 14036374680 |
| 16 | 52714429260 |
| 17 | 198459284400 |
| 18 | 748867149234 |
| 19 | 2831788492218 |
| 20 | 10729442739596 |