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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 43 |
| 6 | 115 |
| 7 | 279 |
| 8 | 719 |
| 9 | 1879 |
| 10 | 4911 |
| 11 | 12659 |
| 12 | 33235 |
| 13 | 86715 |
| 14 | 226315 |
| 15 | 592767 |
| 16 | 1551791 |
| 17 | 4060203 |
| 18 | 10630767 |
| 19 | 27825227 |
| 20 | 72843667 |
| 21 | 190710291 |
| 22 | 499271047 |
| 23 | 1307051711 |
| 24 | 3421933647 |
| 25 | 8958716547 |
| 26 | 23453948495 |
| 27 | 61403187051 |
| 28 | 160755514791 |
| 29 | 420862602279 |
| 30 | 1101832758583 |