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 | 256 |
| 2 | 1526 |
| 3 | 15242 |
| 4 | 106442 |
| 5 | 534597 |
| 6 | 2091240 |
| 7 | 6776036 |
| 8 | 18992711 |
| 9 | 47486564 |
| 10 | 108285671 |
| 11 | 228948163 |
| 12 | 454458310 |
| 13 | 855154435 |
| 14 | 1537112038 |
| 15 | 2655445795 |
| 16 | 4431034438 |
| 17 | 7171212835 |
| 18 | 11295015910 |
| 19 | 17363599363 |
| 20 | 26116502470 |
| 21 | 38514458563 |