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 | 3 |
| 3 | 16 |
| 4 | 48 |
| 5 | 185 |
| 6 | 534 |
| 7 | 1873 |
| 8 | 5397 |
| 9 | 17853 |
| 10 | 51516 |
| 11 | 165882 |
| 12 | 480321 |
| 13 | 1519997 |
| 14 | 4419336 |
| 15 | 13827716 |
| 16 | 40372992 |
| 17 | 125335640 |
| 18 | 367166796 |
| 19 | 1133563870 |
| 20 | 3330422526 |
| 21 | 10238553681 |
| 22 | 30154137624 |
| 23 | 92399944682 |
| 24 | 272682432123 |
| 25 | 833404227103 |
| 26 | 2463640724667 |