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 | 14 |
| 2 | 121 |
| 3 | 834 |
| 4 | 5037 |
| 5 | 27918 |
| 6 | 145777 |
| 7 | 728858 |
| 8 | 3526933 |
| 9 | 16640262 |
| 10 | 76952793 |
| 11 | 350167122 |
| 12 | 1572467389 |
| 13 | 6984206846 |
| 14 | 30735634369 |
| 15 | 134202204426 |
| 16 | 582040933605 |
| 17 | 2509672804470 |
| 18 | 10766469841705 |
| 19 | 45982221941570 |
| 20 | 195609944400781 |