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 | 3 |
| 3 | 9 |
| 4 | 45 |
| 5 | 75 |
| 6 | 175 |
| 7 | 1225 |
| 8 | 11025 |
| 9 | 19845 |
| 10 | 43659 |
| 11 | 160083 |
| 12 | 693693 |
| 13 | 1288287 |
| 14 | 2760615 |
| 15 | 41409225 |
| 16 | 703956825 |
| 17 | 1329696225 |
| 18 | 2807136475 |
| 19 | 10667118605 |
| 20 | 44801898141 |
| 21 | 85530896451 |
| 22 | 178837328943 |
| 23 | 1371086188563 |
| 24 | 11425718238025 |