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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 38 |
| 6 | 209 |
| 7 | 1400 |
| 8 | 10849 |
| 9 | 95516 |
| 10 | 938441 |
| 11 | 10179149 |
| 12 | 120748974 |
| 13 | 1554688240 |
| 14 | 21588485677 |
| 15 | 321561688748 |
| 16 | 5113709884902 |
| 17 | 86469576394028 |
| 18 | 1549114961438599 |
| 19 | 29309613834899864 |
| 20 | 583986501706555597 |
| 21 | 12222118836543561940 |
| 22 | 268060239251978779839 |
| 23 | 6148136982942476816891 |