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 | 11 |
| 3 | 43 |
| 4 | 164 |
| 5 | 760 |
| 6 | 3425 |
| 7 | 15569 |
| 8 | 70323 |
| 9 | 318438 |
| 10 | 1441136 |
| 11 | 6522237 |
| 12 | 29519913 |
| 13 | 133601253 |
| 14 | 604673484 |
| 15 | 2736676090 |
| 16 | 12385962613 |
| 17 | 56057588893 |
| 18 | 253711291691 |
| 19 | 1148272314748 |
| 20 | 5196968663084 |
| 21 | 23520972129705 |
| 22 | 106453623089577 |