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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 5 |
| 6 | -2 |
| 7 | 1 |
| 8 | 30 |
| 9 | 35 |
| 10 | -10 |
| 11 | 5 |
| 12 | 70 |
| 13 | 63 |
| 14 | 8 |
| 15 | -2 |
| 16 | -75 |
| 17 | 35 |
| 18 | 315 |
| 19 | 231 |
| 20 | 56 |
| 21 | -14 |
| 22 | -245 |
| 23 | 105 |
| 24 | 693 |
| 25 | 429 |
| 26 | -272 |
| 27 | 36 |
| 28 | 2268 |
| 29 | -525 |
| 30 | -5880 |
| 31 | 2310 |
| 32 | 12012 |
| 33 | 6435 |
| 34 | -2448 |
| 35 | 324 |
| 36 | 9660 |
| 37 | -2037 |
| 38 | -16632 |
| 39 | 6006 |
| 40 | 25740 |
| 41 | 12155 |
| 42 | 3968 |
| 43 | -304 |
| 44 | -31260 |
| 45 | 3840 |
| 46 | 73395 |
| 47 | -14091 |
| 48 | -90090 |
| 49 | 30030 |
| 50 | 109395 |
| 51 | 46189 |
| 52 | 43648 |
| 53 | -3344 |