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 | 3 |
| 2 | 8 |
| 3 | 22 |
| 4 | 60 |
| 5 | 163 |
| 6 | 443 |
| 7 | 1204 |
| 8 | 3273 |
| 9 | 8897 |
| 10 | 24185 |
| 11 | 65742 |
| 12 | 178705 |
| 13 | 485771 |
| 14 | 1320462 |
| 15 | 3589388 |
| 16 | 9756968 |
| 17 | 26522189 |
| 18 | 72094784 |
| 19 | 195973941 |
| 20 | 532712403 |
| 21 | 1448062445 |
| 22 | 3936241831 |
| 23 | 10699814642 |
| 24 | 29085111709 |
| 25 | 79061530637 |
| 26 | 214911522061 |
| 27 | 584190085145 |