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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 11 |
| 5 | 31 |
| 6 | 101 |
| 7 | 328 |
| 8 | 1102 |
| 9 | 3760 |
| 10 | 13036 |
| 11 | 45750 |
| 12 | 162262 |
| 13 | 580638 |
| 14 | 2093802 |
| 15 | 7601043 |
| 16 | 27756627 |
| 17 | 101888163 |
| 18 | 375750537 |
| 19 | 1391512653 |
| 20 | 5172607767 |
| 21 | 19293659253 |
| 22 | 72188904387 |
| 23 | 270870709263 |
| 24 | 1019033438061 |
| 25 | 3842912963391 |
| 26 | 14524440108761 |