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 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 32 |
| 5 | 93 |
| 6 | 276 |
| 7 | 823 |
| 8 | 2464 |
| 9 | 7385 |
| 10 | 22148 |
| 11 | 66435 |
| 12 | 199296 |
| 13 | 597877 |
| 14 | 1793620 |
| 15 | 5380847 |
| 16 | 16142528 |
| 17 | 48427569 |
| 18 | 145282692 |
| 19 | 435848059 |
| 20 | 1307544160 |
| 21 | 3922632461 |
| 22 | 11767897364 |
| 23 | 35303692071 |
| 24 | 105911076192 |
| 25 | 317733228553 |
| 26 | 953199685636 |
| 27 | 2859599056883 |
| 28 | 8578797170624 |
| 29 | 25736391511845 |