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 | 36 |
| 2 | 540 |
| 3 | 4950 |
| 4 | 32670 |
| 5 | 169884 |
| 6 | 736164 |
| 7 | 2760615 |
| 8 | 9202050 |
| 9 | 27810640 |
| 10 | 77364144 |
| 11 | 200443464 |
| 12 | 488259720 |
| 13 | 1126753200 |
| 14 | 2478857040 |
| 15 | 5226256926 |
| 16 | 10606227291 |
| 17 | 20796524100 |
| 18 | 39525557500 |
| 19 | 73018266750 |
| 20 | 131432880150 |
| 21 | 231003243900 |
| 22 | 397179490500 |
| 23 | 669161098125 |
| 24 | 1106346348900 |