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 | 15 |
| 2 | 232 |
| 3 | 927 |
| 4 | 11906 |
| 5 | 84094 |
| 6 | 845358 |
| 7 | 6847916 |
| 8 | 60473968 |
| 9 | 493271080 |
| 10 | 4110606460 |
| 11 | 33227112639 |
| 12 | 270174922792 |
| 13 | 2170847791630 |
| 14 | 17476736034672 |
| 15 | 140045328565480 |
| 16 | 1123079823815258 |
| 17 | 8990031255733660 |
| 18 | 71987420633900826 |
| 19 | 576024775450468215 |