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) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 40 |
| 4 | 217 |
| 5 | 1158 |
| 6 | 6150 |
| 7 | 32656 |
| 8 | 173719 |
| 9 | 926664 |
| 10 | 4958556 |
| 11 | 26619438 |
| 12 | 143365880 |
| 13 | 774562478 |
| 14 | 4197344582 |
| 15 | 22810572062 |
| 16 | 124300860689 |
| 17 | 679081142350 |
| 18 | 3718894341450 |
| 19 | 20412141531664 |
| 20 | 112276061739814 |
| 21 | 618806031336236 |
| 22 | 3416954495002676 |