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 | 3 |
| 2 | 22 |
| 3 | 82 |
| 4 | 254 |
| 5 | 677 |
| 6 | 1692 |
| 7 | 3972 |
| 8 | 9052 |
| 9 | 19975 |
| 10 | 43394 |
| 11 | 92534 |
| 12 | 195546 |
| 13 | 408489 |
| 14 | 848584 |
| 15 | 1749544 |
| 16 | 3594104 |
| 17 | 7345547 |
| 18 | 14976366 |
| 19 | 30424986 |
| 20 | 61706038 |
| 21 | 124829101 |
| 22 | 252226676 |
| 23 | 508704716 |
| 24 | 1025115156 |
| 25 | 2062984719 |
| 26 | 4149086938 |
| 27 | 8336437438 |
| 28 | 16742227730 |
| 29 | 33599246513 |
| 30 | 67406551968 |