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 | 6 |
| 2 | 22 |
| 3 | 88 |
| 4 | 296 |
| 5 | 1372 |
| 6 | 6128 |
| 7 | 29552 |
| 8 | 147570 |
| 9 | 755512 |
| 10 | 3945876 |
| 11 | 21025260 |
| 12 | 113229974 |
| 13 | 617874744 |
| 14 | 3397997370 |
| 15 | 18844357820 |
| 16 | 105109392654 |
| 17 | 589660050052 |
| 18 | 3322222401602 |
| 19 | 18796006629928 |
| 20 | 106695843736852 |
| 21 | 607569787629568 |