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 | 129 |
| 3 | 2572 |
| 4 | 75053 |
| 5 | 3228316 |
| 6 | 129317797 |
| 7 | 6067246144 |
| 8 | 321040274585 |
| 9 | 17868559819600 |
| 10 | 1077981490855241 |
| 11 | 69836621117631424 |
| 12 | 4779269972787701701 |
| 13 | 345917535629669229760 |
| 14 | 26385854407691758178669 |
| 15 | 2109071203770345994999936 |
| 16 | 176264605227324999129677873 |