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 | 13 |
| 2 | 410 |
| 3 | 2210 |
| 4 | 10370 |
| 5 | 202130 |
| 6 | 229970 |
| 7 | 197210 |
| 8 | 81770 |
| 9 | 18423410 |
| 10 | 16046810 |
| 11 | 12625730 |
| 12 | 21899930 |
| 13 | 9549410 |
| 14 | 370247930 |
| 15 | 416392730 |
| 16 | 579994610 |
| 17 | 338609570 |
| 18 | 2155919090 |
| 19 | 601741010 |
| 20 | 254885930 |
| 21 | 10083683090 |
| 22 | 4690939370 |
| 23 | 29207671610 |