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 | 6 |
| 2 | 35 |
| 3 | 198 |
| 4 | 1081 |
| 5 | 6121 |
| 6 | 42372 |
| 7 | 281987 |
| 8 | 1816080 |
| 9 | 11359441 |
| 10 | 69118332 |
| 11 | 409120667 |
| 12 | 2352069720 |
| 13 | 13087371961 |
| 14 | 70021883892 |
| 15 | 454630639122 |
| 16 | 3083813678879 |
| 17 | 20184430499034 |
| 18 | 128112059869885 |
| 19 | 790520789974362 |
| 20 | 4746103264506599 |