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 | 16 |
| 2 | 21 |
| 3 | 51 |
| 4 | 148 |
| 5 | 372 |
| 6 | 1359 |
| 7 | 4223 |
| 8 | 12765 |
| 9 | 36991 |
| 10 | 120577 |
| 11 | 379049 |
| 12 | 1163511 |
| 13 | 3513789 |
| 14 | 11057011 |
| 15 | 34615371 |
| 16 | 107067003 |
| 17 | 328256519 |
| 18 | 1021668031 |
| 19 | 3184852651 |
| 20 | 9877177123 |
| 21 | 30474354613 |
| 22 | 94542321045 |
| 23 | 293938006889 |
| 24 | 912146326937 |
| 25 | 2822284649841 |