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 | 220 |
| 2 | 5302 |
| 3 | 33528 |
| 4 | 116380 |
| 5 | 339064 |
| 6 | 719400 |
| 7 | 1538416 |
| 8 | 2624182 |
| 9 | 4763220 |
| 10 | 7217144 |
| 11 | 11676280 |
| 12 | 16317048 |
| 13 | 25022184 |
| 14 | 32503680 |
| 15 | 47430768 |
| 16 | 59759260 |
| 17 | 82927856 |
| 18 | 101189550 |
| 19 | 137904360 |
| 20 | 161928184 |
| 21 | 215389680 |
| 22 | 250679288 |
| 23 | 323294576 |
| 24 | 369052200 |
| 25 | 474160324 |
| 26 | 527004280 |
| 27 | 668075232 |
| 28 | 742047856 |