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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 31 |
| 5 | 152 |
| 6 | 813 |
| 7 | 4741 |
| 8 | 29956 |
| 9 | 203305 |
| 10 | 1470795 |
| 11 | 11276718 |
| 12 | 91221419 |
| 13 | 775677177 |
| 14 | 6910797962 |
| 15 | 64326920851 |
| 16 | 623981351195 |
| 17 | 6293426736344 |
| 18 | 65867162316433 |
| 19 | 714062197266081 |
| 20 | 8005397253530924 |
| 21 | 92676194887133693 |
| 22 | 1106385117766336919 |
| 23 | 13603803900252612966 |
| 24 | 172082332173918135687 |