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 | 4 |
| 5 | 11 |
| 6 | 24 |
| 7 | 70 |
| 8 | 163 |
| 9 | 496 |
| 10 | 1199 |
| 11 | 3746 |
| 12 | 9291 |
| 13 | 29572 |
| 14 | 74712 |
| 15 | 241078 |
| 16 | 617612 |
| 17 | 2013979 |
| 18 | 5215990 |
| 19 | 17151362 |
| 20 | 44809646 |
| 21 | 148345585 |
| 22 | 390352720 |
| 23 | 1299558642 |
| 24 | 3440133086 |
| 25 | 11507046875 |
| 26 | 30615708092 |
| 27 | 102821083832 |
| 28 | 274759034372 |
| 29 | 925976586616 |
| 30 | 2483758221924 |