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) |
|---|---|
| 1 | 81 |
| 2 | 2025 |
| 3 | 3025 |
| 4 | 9801 |
| 5 | 494209 |
| 6 | 998001 |
| 7 | 24502500 |
| 8 | 25502500 |
| 9 | 52881984 |
| 10 | 60481729 |
| 11 | 99980001 |
| 12 | 6049417284 |
| 13 | 6832014336 |
| 14 | 9048004641 |
| 15 | 9999800001 |
| 16 | 101558217124 |
| 17 | 108878221089 |
| 18 | 123448227904 |
| 19 | 127194229449 |
| 20 | 152344237969 |
| 21 | 213018248521 |
| 22 | 217930248900 |
| 23 | 249500250000 |
| 24 | 250500250000 |