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) |
|---|---|
| 0 | 2 |
| 1 | 9 |
| 2 | 34 |
| 3 | 127 |
| 4 | 474 |
| 5 | 1769 |
| 6 | 6602 |
| 7 | 24639 |
| 8 | 91954 |
| 9 | 343177 |
| 10 | 1280754 |
| 11 | 4779839 |
| 12 | 17838602 |
| 13 | 66574569 |
| 14 | 248459674 |
| 15 | 927264127 |
| 16 | 3460596834 |
| 17 | 12915123209 |
| 18 | 48199896002 |
| 19 | 179884460799 |
| 20 | 671337947194 |
| 21 | 2505467327977 |
| 22 | 9350531364714 |
| 23 | 34896658130879 |
| 24 | 130236101158802 |
| 25 | 486047746504329 |