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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 29 |
| 6 | 166 |
| 7 | 1023 |
| 8 | 6922 |
| 9 | 48311 |
| 10 | 346543 |
| 11 | 2522522 |
| 12 | 18598427 |
| 13 | 138462649 |
| 14 | 1039496297 |
| 15 | 7859514470 |
| 16 | 59795121480 |
| 17 | 457409613979 |
| 18 | 3516009200564 |
| 19 | 27144143923583 |
| 20 | 210375361379518 |
| 21 | 1636229771639924 |
| 22 | 12766882202755783 |