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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 19 |
| 5 | 50 |
| 6 | 162 |
| 7 | 576 |
| 8 | 2469 |
| 9 | 11218 |
| 10 | 59984 |
| 11 | 331432 |
| 12 | 2120663 |
| 13 | 13784290 |
| 14 | 102616622 |
| 15 | 766648128 |
| 16 | 6507054537 |
| 17 | 54919451490 |
| 18 | 523342287196 |
| 19 | 4923469621256 |
| 20 | 52040350449307 |
| 21 | 539901936037202 |
| 22 | 6268123599148282 |