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 | 0 |
| 2 | 2 |
| 3 | 11 |
| 4 | 47 |
| 5 | 193 |
| 6 | 778 |
| 7 | 3118 |
| 8 | 12480 |
| 9 | 49929 |
| 10 | 199725 |
| 11 | 798911 |
| 12 | 3195656 |
| 13 | 12782636 |
| 14 | 51130558 |
| 15 | 204522247 |
| 16 | 818089003 |
| 17 | 3272356029 |
| 18 | 13089424134 |
| 19 | 52357696554 |
| 20 | 209430786236 |
| 21 | 837723144965 |
| 22 | 3350892579881 |
| 23 | 13403570319547 |
| 24 | 53614281278212 |
| 25 | 214457125112872 |