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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 10 |
| 5 | 34 |
| 6 | 54 |
| 7 | 234 |
| 8 | 402 |
| 9 | 1938 |
| 10 | 17490 |
| 11 | 19590 |
| 12 | 209670 |
| 13 | 237390 |
| 14 | 2933070 |
| 15 | 43575630 |
| 16 | 696759630 |
| 17 | 697240110 |
| 18 | 12541643310 |
| 19 | 12550832490 |
| 20 | 250832355690 |