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) |
|---|---|
| 41 | 1 |
| 42 | 42 |
| 43 | 903 |
| 44 | 13244 |
| 45 | 148995 |
| 46 | 1370754 |
| 47 | 10737573 |
| 48 | 73629072 |
| 49 | 450978066 |
| 50 | 2505433700 |
| 51 | 12777711870 |
| 52 | 60403728840 |
| 53 | 266783135710 |
| 54 | 1108176102180 |
| 55 | 4353548972850 |
| 56 | 16253249498640 |
| 57 | 57902201338905 |
| 58 | 197548686920970 |
| 59 | 647520696018735 |
| 60 | 2044802197953900 |
| 61 | 6236646703759395 |