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 | 2 |
| 1 | 4 |
| 2 | 9 |
| 3 | 23 |
| 4 | 55 |
| 5 | 126 |
| 6 | 292 |
| 7 | 679 |
| 8 | 1579 |
| 9 | 3671 |
| 10 | 8534 |
| 11 | 19839 |
| 12 | 46120 |
| 13 | 107216 |
| 14 | 249247 |
| 15 | 579429 |
| 16 | 1347009 |
| 17 | 3131416 |
| 18 | 7279659 |
| 19 | 16923154 |
| 20 | 39341560 |
| 21 | 91458031 |
| 22 | 212614127 |
| 23 | 494267879 |
| 24 | 1149033414 |
| 25 | 2671178611 |
| 26 | 6209736884 |
| 27 | 14435886844 |
| 28 | 33559365375 |
| 29 | 78016059321 |
| 30 | 181365334057 |