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 | 70 |
| 3 | 209 |
| 4 | 378 |
| 5 | 1653 |
| 6 | 2697 |
| 7 | 4806 |
| 8 | 13744 |
| 9 | 66919 |
| 10 | 67873 |
| 11 | 75666 |
| 12 | 81125 |
| 13 | 173389 |
| 14 | 529938 |
| 15 | 1572706 |
| 16 | 4751419 |
| 17 | 7159431 |
| 18 | 7840546 |
| 19 | 15896994 |
| 20 | 71074288 |
| 21 | 119325567 |