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 | 1 |
| 2 | 14 |
| 3 | 216 |
| 4 | 3145 |
| 5 | 44252 |
| 6 | 641640 |
| 7 | 12305251 |
| 8 | 163304624 |
| 9 | 2516300046 |
| 10 | 36351200665 |
| 11 | 542225612642 |
| 12 | 11012302601310 |
| 13 | 143163240420331 |
| 14 | 2224515456064634 |
| 15 | 32255340625240206 |
| 16 | 453016062064453015 |
| 17 | 6552245200234552232 |
| 18 | 125142553603416142350 |