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 | 30 |
| 1 | 1801 |
| 2 | 108090 |
| 3 | 6487201 |
| 4 | 389340150 |
| 5 | 23366896201 |
| 6 | 1402403112210 |
| 7 | 84167553628801 |
| 8 | 5051455620840270 |
| 9 | 303171504804045001 |
| 10 | 18195341743863540330 |
| 11 | 1092023676136616464801 |
| 12 | 65539615909940851428390 |
| 13 | 3933468978272587702168201 |
| 14 | 236073678312265202981520450 |
| 15 | 14168354167714184766593395201 |