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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 31 |
| 5 | 83 |
| 6 | 201 |
| 7 | 487 |
| 8 | 1141 |
| 9 | 2641 |
| 10 | 5972 |
| 11 | 13309 |
| 12 | 29248 |
| 13 | 63360 |
| 14 | 135688 |
| 15 | 287197 |
| 16 | 601629 |
| 17 | 1247909 |
| 18 | 2565037 |
| 19 | 5226816 |
| 20 | 10565132 |
| 21 | 21192569 |
| 22 | 42202909 |
| 23 | 83466925 |
| 24 | 163999684 |
| 25 | 320230999 |
| 26 | 621579965 |
| 27 | 1199659836 |
| 28 | 2302765961 |
| 29 | 4397132933 |
| 30 | 8354234552 |
| 31 | 15795913477 |