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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 45 |
| 8 | 107 |
| 9 | 278 |
| 10 | 728 |
| 11 | 2033 |
| 12 | 5749 |
| 13 | 17105 |
| 14 | 51669 |
| 15 | 162674 |
| 16 | 520524 |
| 17 | 1724329 |
| 18 | 5807143 |
| 19 | 20146861 |
| 20 | 71048431 |
| 21 | 257139686 |
| 22 | 945626800 |
| 23 | 3558489633 |
| 24 | 13599579817 |
| 25 | 53060155137 |
| 26 | 210124405097 |
| 27 | 847904374466 |
| 28 | 3470756061140 |
| 29 | 14453943647561 |
| 30 | 61023690771451 |