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 | 6 |
| 1 | 55 |
| 2 | 280 |
| 3 | 1045 |
| 4 | 3190 |
| 5 | 8437 |
| 6 | 20020 |
| 7 | 43615 |
| 8 | 88660 |
| 9 | 170170 |
| 10 | 311168 |
| 11 | 545870 |
| 12 | 923780 |
| 13 | 1514870 |
| 14 | 2416040 |
| 15 | 3759074 |
| 16 | 5720330 |
| 17 | 8532425 |
| 18 | 12498200 |
| 19 | 18007275 |
| 20 | 25555530 |
| 21 | 35767875 |
| 22 | 49424700 |
| 23 | 67492425 |
| 24 | 91158600 |
| 25 | 121872036 |
| 26 | 161388480 |
| 27 | 211822380 |