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 | 125 |
| 3 | 906 |
| 4 | 5810 |
| 5 | 34364 |
| 6 | 191901 |
| 7 | 1026610 |
| 8 | 5312230 |
| 9 | 26767940 |
| 10 | 131990066 |
| 11 | 639210404 |
| 12 | 3048892740 |
| 13 | 14354652152 |
| 14 | 66828135005 |
| 15 | 308078809794 |
| 16 | 1408022619806 |
| 17 | 6385966846580 |
| 18 | 28765327498278 |
| 19 | 128777533131500 |