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 | 1 |
| 3 | 11 |
| 4 | 76 |
| 5 | 681 |
| 6 | 5951 |
| 7 | 55848 |
| 8 | 535183 |
| 9 | 5271067 |
| 10 | 52869443 |
| 11 | 538800385 |
| 12 | 5561723366 |
| 13 | 58036466462 |
| 14 | 611198554760 |
| 15 | 6487849585537 |
| 16 | 69343498969503 |
| 17 | 745643172902139 |
| 18 | 8060711122273285 |
| 19 | 87554655576067959 |
| 20 | 955068718558844654 |
| 21 | 10458203081050142684 |
| 22 | 114918482735213986323 |