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 | 4 |
| 2 | 4 |
| 3 | 12 |
| 4 | 17 |
| 5 | 24 |
| 6 | 67 |
| 7 | 158 |
| 8 | 298 |
| 9 | 595 |
| 10 | 1337 |
| 11 | 2863 |
| 12 | 5840 |
| 13 | 12231 |
| 14 | 26168 |
| 15 | 55140 |
| 16 | 115193 |
| 17 | 242621 |
| 18 | 512713 |
| 19 | 1078852 |
| 20 | 2267487 |
| 21 | 4776110 |
| 22 | 10063518 |
| 23 | 21181387 |
| 24 | 44579665 |
| 25 | 93874659 |
| 26 | 197672892 |
| 27 | 416137435 |
| 28 | 876080072 |
| 29 | 1844597384 |
| 30 | 3883701257 |
| 31 | 8176491213 |