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) |
|---|---|
| 1 | 9 |
| 2 | 16 |
| 3 | 30 |
| 4 | 56 |
| 5 | 106 |
| 6 | 200 |
| 7 | 380 |
| 8 | 720 |
| 9 | 1370 |
| 10 | 2600 |
| 11 | 4950 |
| 12 | 9400 |
| 13 | 17900 |
| 14 | 34000 |
| 15 | 64750 |
| 16 | 123000 |
| 17 | 234250 |
| 18 | 445000 |
| 19 | 847500 |
| 20 | 1610000 |
| 21 | 3066250 |
| 22 | 5825000 |
| 23 | 11093750 |
| 24 | 21075000 |
| 25 | 40137500 |
| 26 | 76250000 |
| 27 | 145218750 |
| 28 | 275875000 |
| 29 | 525406250 |
| 30 | 998125000 |
| 31 | 1900937500 |