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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 64 |
| 6 | 92 |
| 7 | 246 |
| 8 | 752 |
| 9 | 1289 |
| 10 | 2084 |
| 11 | 3383 |
| 12 | 31284 |
| 13 | 271259 |
| 14 | 618525 |
| 15 | 1389315 |
| 16 | 2228197 |
| 17 | 2914847 |
| 18 | 6857528 |
| 19 | 7457772 |
| 20 | 141236709 |
| 21 | 366883983 |
| 22 | 1034128714 |
| 23 | 3690981956 |
| 24 | 4965932454 |
| 25 | 7863515482 |
| 26 | 19824941433 |
| 27 | 195348751601 |
| 28 | 292557888940 |
| 29 | 2296552237422 |