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 | 6 |
| 3 | 20 |
| 4 | 69 |
| 5 | 196 |
| 6 | 554 |
| 7 | 1368 |
| 8 | 3240 |
| 9 | 7110 |
| 10 | 14896 |
| 11 | 29624 |
| 12 | 56755 |
| 13 | 104468 |
| 14 | 186484 |
| 15 | 322800 |
| 16 | 544590 |
| 17 | 896259 |
| 18 | 1443834 |
| 19 | 2278640 |
| 20 | 3531647 |
| 21 | 5380064 |
| 22 | 8069672 |
| 23 | 11926928 |
| 24 | 17392983 |
| 25 | 25042836 |
| 26 | 35637168 |
| 27 | 50152068 |
| 28 | 69853604 |
| 29 | 96344440 |
| 30 | 131669538 |