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 | 0 |
| 2 | 280 |
| 3 | 637 |
| 4 | 1437 |
| 5 | 2937 |
| 6 | 4960 |
| 7 | 9580 |
| 8 | 18300 |
| 9 | 30081 |
| 10 | 57001 |
| 11 | 107821 |
| 12 | 176484 |
| 13 | 333384 |
| 14 | 629584 |
| 15 | 1029781 |
| 16 | 1944261 |
| 17 | 3670641 |
| 18 | 6003160 |
| 19 | 11333140 |
| 20 | 21395220 |
| 21 | 34990137 |
| 22 | 66055537 |
| 23 | 124701637 |
| 24 | 203938620 |
| 25 | 385001040 |
| 26 | 726815560 |
| 27 | 1188642541 |
| 28 | 2243951661 |
| 29 | 4236192681 |
| 30 | 6927917584 |