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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 5 |
| 9 | 15 |
| 10 | 52 |
| 11 | 203 |
| 12 | 878 |
| 13 | 4172 |
| 14 | 21767 |
| 15 | 125536 |
| 16 | 809254 |
| 17 | 5890115 |
| 18 | 48560551 |
| 19 | 450859572 |
| 20 | 4657423009 |
| 21 | 52802518648 |
| 22 | 649162712358 |
| 23 | 8574743501046 |
| 24 | 120876064485660 |
| 25 | 1809924607067234 |
| 26 | 28694297293078915 |
| 27 | 480719498205658859 |
| 28 | 8502406681853097237 |