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 | 66 |
| 3 | 797 |
| 4 | 5024 |
| 5 | 21447 |
| 6 | 73920 |
| 7 | 212951 |
| 8 | 552378 |
| 9 | 1292410 |
| 10 | 2838234 |
| 11 | 5823262 |
| 12 | 11464628 |
| 13 | 21488403 |
| 14 | 39094986 |
| 15 | 68600554 |
| 16 | 117628414 |
| 17 | 196085189 |
| 18 | 321067770 |
| 19 | 513857202 |
| 20 | 810429626 |
| 21 | 1254814258 |
| 22 | 1918760856 |
| 23 | 2889290459 |
| 24 | 4305268546 |
| 25 | 6331543700 |
| 26 | 9226796660 |
| 27 | 13297146272 |