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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 35 |
| 5 | 104 |
| 6 | 312 |
| 7 | 924 |
| 8 | 2754 |
| 9 | 8195 |
| 10 | 24386 |
| 11 | 72576 |
| 12 | 215991 |
| 13 | 642785 |
| 14 | 1912960 |
| 15 | 5693016 |
| 16 | 16942573 |
| 17 | 50421592 |
| 18 | 150056090 |
| 19 | 446571180 |
| 20 | 1329008590 |
| 21 | 3955167387 |
| 22 | 11770690808 |
| 23 | 35029911168 |
| 24 | 104250013425 |
| 25 | 310251009501 |
| 26 | 923315841860 |
| 27 | 2747814245904 |
| 28 | 8177573467339 |
| 29 | 24336691577000 |