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) |
|---|---|
| 4 | 2 |
| 5 | 11 |
| 6 | 58 |
| 7 | 236 |
| 8 | 802 |
| 9 | 2396 |
| 10 | 6508 |
| 11 | 16448 |
| 12 | 39331 |
| 13 | 90102 |
| 14 | 199652 |
| 15 | 431128 |
| 16 | 912644 |
| 17 | 1902808 |
| 18 | 3921896 |
| 19 | 8014336 |
| 20 | 16273829 |
| 21 | 32893762 |
| 22 | 66268224 |
| 23 | 133194248 |
| 24 | 267276526 |
| 25 | 535737092 |
| 26 | 1073034964 |
| 27 | 2148105728 |
| 28 | 4298841031 |
| 29 | 8601047918 |
| 30 | 17206367884 |
| 31 | 34418115384 |
| 32 | 68842955288 |