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 | 2 |
| 3 | 20 |
| 4 | 38 |
| 5 | 290 |
| 6 | 542 |
| 7 | 3710 |
| 8 | 6878 |
| 9 | 44390 |
| 10 | 81902 |
| 11 | 509510 |
| 12 | 937118 |
| 13 | 5685590 |
| 14 | 10434062 |
| 15 | 62170310 |
| 16 | 113906558 |
| 17 | 669532790 |
| 18 | 1225159022 |
| 19 | 7125795110 |
| 20 | 13026431198 |
| 21 | 75132155990 |
| 22 | 137237880782 |
| 23 | 786189403910 |
| 24 | 1435140927038 |