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 | 2 |
| 2 | 3 |
| 3 | 1 |
| 4 | -14 |
| 5 | -59 |
| 6 | -99 |
| 7 | 288 |
| 8 | 2885 |
| 9 | 10365 |
| 10 | 1700 |
| 11 | -226313 |
| 12 | -1535203 |
| 13 | -4258630 |
| 14 | 17243695 |
| 15 | 284513877 |
| 16 | 1688253890 |
| 17 | 2750940953 |
| 18 | -51540956455 |
| 19 | -624352447488 |
| 20 | -3470378651847 |
| 21 | -496964048927 |
| 22 | 204678286709292 |
| 23 | 2311290490508227 |
| 24 | 12611758414937801 |