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 | 25 |
| 2 | 225 |
| 3 | 1225 |
| 4 | 4900 |
| 5 | 15876 |
| 6 | 44100 |
| 7 | 108900 |
| 8 | 245025 |
| 9 | 511225 |
| 10 | 1002001 |
| 11 | 1863225 |
| 12 | 3312400 |
| 13 | 5664400 |
| 14 | 9363600 |
| 15 | 15023376 |
| 16 | 23474025 |
| 17 | 35820225 |
| 18 | 53509225 |
| 19 | 78411025 |
| 20 | 112911876 |
| 21 | 160022500 |
| 22 | 223502500 |
| 23 | 308002500 |
| 24 | 419225625 |
| 25 | 564110001 |
| 26 | 751034025 |
| 27 | 990046225 |
| 28 | 1293121600 |
| 29 | 1674446400 |
| 30 | 2150733376 |