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 | 0 |
| 1 | 225 |
| 2 | 40401 |
| 3 | 2042041 |
| 4 | 317231721 |
| 5 | 16198161984 |
| 6 | 3921203921209 |
| 7 | 400000040000001 |
| 8 | 23391004233910041 |
| 9 | 1100298301100298304 |
| 10 | 141162631214116263129 |
| 11 | 1322314049613223140496 |
| 12 | 3171326702963171326702969 |
| 13 | 107786983188610778698318864 |
| 14 | 29726516052320297265160523209 |
| 15 | 1003781781031081003781781031081 |