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 | 11 |
| 2 | 171 |
| 3 | 2126 |
| 4 | 24300 |
| 5 | 266400 |
| 6 | 2853708 |
| 7 | 30130317 |
| 8 | 315037281 |
| 9 | 3271067968 |
| 10 | 33787242719 |
| 11 | 347589015681 |
| 12 | 3564432632541 |
| 13 | 36457601891708 |
| 14 | 372096179850464 |
| 15 | 3790896863469849 |
| 16 | 38562555830676602 |
| 17 | 391760068087338367 |
| 18 | 3975397006170581823 |
| 19 | 40066272402579605194 |