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 | 3 |
| 1 | 13 |
| 2 | 96 |
| 3 | 780 |
| 4 | 6684 |
| 5 | 58812 |
| 6 | 523932 |
| 7 | 4693884 |
| 8 | 42158940 |
| 9 | 379086396 |
| 10 | 3410401308 |
| 11 | 30688106748 |
| 12 | 276170940636 |
| 13 | 2485450385340 |
| 14 | 22368701146524 |
| 15 | 201316901032572 |
| 16 | 1811846472148572 |
| 17 | 16306595700758844 |
| 18 | 146759271112516380 |
| 19 | 1320833079235394556 |