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 | 21 |
| 2 | 1750 |
| 3 | 48501 |
| 4 | 955347 |
| 5 | 16205001 |
| 6 | 251740932 |
| 7 | 3634987413 |
| 8 | 48847405083 |
| 9 | 611199661843 |
| 10 | 7140933364136 |
| 11 | 78280456105686 |
| 12 | 809842005695656 |
| 13 | 7953581118077240 |
| 14 | 74557744904209329 |
| 15 | 670158115881138987 |