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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 41 |
| 8 | 157 |
| 9 | 803 |
| 10 | 5564 |
| 11 | 53384 |
| 12 | 718844 |
| 13 | 13783708 |
| 14 | 380676448 |
| 15 | 15298907733 |
| 16 | 902438020514 |
| 17 | 78720750045598 |
| 18 | 10220860796171917 |
| 19 | 1986422867300209784 |
| 20 | 580763241873718042562 |
| 21 | 256553744608217295298827 |
| 22 | 171912553856721407543178940 |
| 23 | 175350753369071026461010505478 |