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 | 7 |
| 5 | 31 |
| 6 | 211 |
| 7 | 1051 |
| 8 | 10081 |
| 9 | 107857 |
| 10 | 1227241 |
| 11 | 8969401 |
| 12 | 108817831 |
| 13 | 1173362191 |
| 14 | 19426473067 |
| 15 | 320062090531 |
| 16 | 5692838161921 |
| 17 | 70426164947041 |
| 18 | 1346222143950481 |
| 19 | 21952313047471537 |
| 20 | 493701484264143751 |
| 21 | 10971915198235355071 |
| 22 | 266542798822750395331 |