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 | 10 |
| 2 | 69 |
| 3 | 398 |
| 4 | 2057 |
| 5 | 9858 |
| 6 | 44685 |
| 7 | 194022 |
| 8 | 813969 |
| 9 | 3319866 |
| 10 | 13224789 |
| 11 | 51635070 |
| 12 | 198148761 |
| 13 | 749016882 |
| 14 | 2794021533 |
| 15 | 10300389462 |
| 16 | 37575535905 |
| 17 | 135782112618 |
| 18 | 486470994021 |
| 19 | 1729358969454 |
| 20 | 6104068084521 |
| 21 | 21404982017250 |
| 22 | 74609825192109 |