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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 36 |
| 7 | 79 |
| 8 | 186 |
| 9 | 462 |
| 10 | 1222 |
| 11 | 3435 |
| 12 | 10397 |
| 13 | 33578 |
| 14 | 115624 |
| 15 | 419789 |
| 16 | 1585217 |
| 17 | 6130130 |
| 18 | 23928972 |
| 19 | 93161541 |
| 20 | 358570997 |
| 21 | 1356178991 |
| 22 | 5021267644 |
| 23 | 18160079508 |
| 24 | 64086748267 |
| 25 | 220608700157 |
| 26 | 740874170362 |
| 27 | 2428425908049 |
| 28 | 7773761586051 |
| 29 | 24320543815203 |
| 30 | 74418574119634 |
| 31 | 222890851257632 |