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 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 19 |
| 5 | 38 |
| 6 | 42 |
| 7 | 68 |
| 8 | 243 |
| 9 | 384 |
| 10 | 515 |
| 11 | 740 |
| 12 | 1709 |
| 13 | 5151 |
| 14 | 11049 |
| 15 | 45641 |
| 16 | 94729 |
| 17 | 185610 |
| 18 | 644593 |
| 19 | 726681 |
| 20 | 2296396 |
| 21 | 3098358 |
| 22 | 6178778 |
| 23 | 15743325 |
| 24 | 22436908 |
| 25 | 80141430 |
| 26 | 84300971 |
| 27 | 127495932 |
| 28 | 177416979 |
| 29 | 198423144 |
| 30 | 275354607 |