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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 24 |
| 5 | 84 |
| 6 | 315 |
| 7 | 1225 |
| 8 | 4859 |
| 9 | 19646 |
| 10 | 80739 |
| 11 | 336050 |
| 12 | 1413587 |
| 13 | 6000777 |
| 14 | 25674462 |
| 15 | 110598855 |
| 16 | 479286932 |
| 17 | 2088036939 |
| 18 | 9139604421 |
| 19 | 40174594432 |
| 20 | 177267942918 |
| 21 | 784889441217 |
| 22 | 3486198469890 |
| 23 | 15529021825140 |
| 24 | 69355660644738 |
| 25 | 310509670642611 |
| 26 | 1393296782758244 |