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 | 26 |
| 2 | 676 |
| 3 | 4374 |
| 4 | 22509 |
| 5 | 100113 |
| 6 | 365094 |
| 7 | 1297475 |
| 8 | 4270706 |
| 9 | 13590286 |
| 10 | 42625930 |
| 11 | 130699519 |
| 12 | 399690465 |
| 13 | 1215848564 |
| 14 | 3691100941 |
| 15 | 11226074606 |
| 16 | 34145746428 |
| 17 | 104075385414 |
| 18 | 317743494589 |
| 19 | 971393987589 |
| 20 | 2974474452642 |
| 21 | 9117734590027 |