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 | 3 |
| 3 | 15 |
| 4 | 83 |
| 5 | 486 |
| 6 | 2967 |
| 7 | 18748 |
| 8 | 121725 |
| 9 | 807381 |
| 10 | 5447203 |
| 11 | 37264974 |
| 12 | 257896500 |
| 13 | 1802312605 |
| 14 | 12701190885 |
| 15 | 90157130289 |
| 16 | 644022007040 |
| 17 | 4626159163233 |