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 | 18 |
| 3 | 61 |
| 4 | 182 |
| 5 | 506 |
| 6 | 1338 |
| 7 | 3369 |
| 8 | 8172 |
| 9 | 19197 |
| 10 | 43833 |
| 11 | 97636 |
| 12 | 212748 |
| 13 | 454461 |
| 14 | 953505 |
| 15 | 1968095 |
| 16 | 4001627 |
| 17 | 8024295 |
| 18 | 15885484 |
| 19 | 31074351 |
| 20 | 60111277 |
| 21 | 115071431 |
| 22 | 218126868 |
| 23 | 409662895 |
| 24 | 762679151 |
| 25 | 1408172844 |
| 26 | 2579599582 |
| 27 | 4690277001 |
| 28 | 8467363674 |
| 29 | 15182486586 |