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 | 5 |
| 2 | 19 |
| 3 | 59 |
| 4 | 165 |
| 5 | 419 |
| 6 | 1001 |
| 7 | 2257 |
| 8 | 4877 |
| 9 | 10133 |
| 10 | 20399 |
| 11 | 39881 |
| 12 | 76085 |
| 13 | 141877 |
| 14 | 259373 |
| 15 | 465493 |
| 16 | 821813 |
| 17 | 1428725 |
| 18 | 2449573 |
| 19 | 4145249 |
| 20 | 6931259 |
| 21 | 11459483 |
| 22 | 18749007 |
| 23 | 30373189 |
| 24 | 48752125 |
| 25 | 77568683 |
| 26 | 122406223 |
| 27 | 191651957 |
| 28 | 297856813 |
| 29 | 459652759 |
| 30 | 704595749 |
| 31 | 1073152385 |