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 | 7 |
| 2 | 37 |
| 3 | 197 |
| 4 | 1041 |
| 5 | 5503 |
| 6 | 29089 |
| 7 | 153769 |
| 8 | 812849 |
| 9 | 4296863 |
| 10 | 22713981 |
| 11 | 120070149 |
| 12 | 634712209 |
| 13 | 3355201895 |
| 14 | 17736195433 |
| 15 | 93756691401 |
| 16 | 495614587553 |
| 17 | 2619907077991 |
| 18 | 13849295944501 |
| 19 | 73209847696773 |