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 | 4 |
| 3 | 11 |
| 4 | 60 |
| 5 | 318 |
| 6 | 2806 |
| 7 | 29359 |
| 8 | 396196 |
| 9 | 6231794 |
| 10 | 112137138 |
| 11 | 2249479114 |
| 12 | 49691965745 |
| 13 | 1197158348160 |
| 14 | 31230408793660 |
| 15 | 876971159096883 |
| 16 | 26374570956403684 |
| 17 | 845812191249484022 |
| 18 | 28812214090645864661 |
| 19 | 1038982259432805270094 |
| 20 | 39540452134474760212909 |